Googletest export
Simplify the fallback printing logic to have a single sequence of trial printers. PiperOrigin-RevId: 298621376
This commit is contained in:
Abseil Team
vslashg
parent
3de76551e0
commit
0bf8ea3065
@ -119,106 +119,91 @@
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namespace testing {
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namespace testing {
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// Definitions in the 'internal' and 'internal2' name spaces are
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// Definitions in the internal* namespaces are subject to change without notice.
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// subject to change without notice. DO NOT USE THEM IN USER CODE!
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// DO NOT USE THEM IN USER CODE!
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namespace internal2 {
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namespace internal {
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// Prints the given number of bytes in the given object to the given
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// ostream.
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GTEST_API_ void PrintBytesInObjectTo(const unsigned char* obj_bytes,
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size_t count,
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::std::ostream* os);
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// For selecting which printer to use when a given type has neither <<
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// nor PrintTo().
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enum TypeKind {
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kProtobuf, // a protobuf type
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kConvertibleToInteger, // a type implicitly convertible to BiggestInt
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// (e.g. a named or unnamed enum type)
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#if GTEST_INTERNAL_HAS_STRING_VIEW
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kConvertibleToStringView, // a type implicitly convertible to
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// absl::string_view or std::string_view
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#endif
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kOtherType // anything else
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};
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// TypeWithoutFormatter<T, kTypeKind>::PrintValue(value, os) is called
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// by the universal printer to print a value of type T when neither
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// operator<< nor PrintTo() is defined for T, where kTypeKind is the
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// "kind" of T as defined by enum TypeKind.
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template <typename T, TypeKind kTypeKind>
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class TypeWithoutFormatter {
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public:
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// This default version is called when kTypeKind is kOtherType.
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static void PrintValue(const T& value, ::std::ostream* os) {
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PrintBytesInObjectTo(
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static_cast<const unsigned char*>(
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reinterpret_cast<const void*>(std::addressof(value))),
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sizeof(value), os);
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}
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};
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// We print a protobuf using its ShortDebugString() when the string
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// doesn't exceed this many characters; otherwise we print it using
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// DebugString() for better readability.
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const size_t kProtobufOneLinerMaxLength = 50;
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template <typename T>
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template <typename T>
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class TypeWithoutFormatter<T, kProtobuf> {
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void UniversalPrint(const T& value, ::std::ostream* os);
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public:
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static void PrintValue(const T& value, ::std::ostream* os) {
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// Used to print an STL-style container when the user doesn't define
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std::string pretty_str = value.ShortDebugString();
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// a PrintTo() for it.
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if (pretty_str.length() > kProtobufOneLinerMaxLength) {
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struct ContainerPrinter {
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pretty_str = "\n" + value.DebugString();
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template <typename T,
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typename = typename std::enable_if<
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(sizeof(IsContainerTest<T>(0)) == sizeof(IsContainer)) &&
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!IsRecursiveContainer<T>::value>::type>
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static void PrintValue(const T& container, std::ostream* os) {
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const size_t kMaxCount = 32; // The maximum number of elements to print.
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*os << '{';
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size_t count = 0;
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for (auto&& elem : container) {
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if (count > 0) {
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*os << ',';
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if (count == kMaxCount) { // Enough has been printed.
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*os << " ...";
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break;
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}
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}
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*os << ' ';
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// We cannot call PrintTo(elem, os) here as PrintTo() doesn't
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// handle `elem` being a native array.
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internal::UniversalPrint(elem, os);
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++count;
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}
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}
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*os << ("<" + pretty_str + ">");
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if (count > 0) {
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*os << ' ';
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}
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*os << '}';
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}
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}
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};
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};
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template <typename T>
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// Used to print a pointer that is neither a char pointer nor a member
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class TypeWithoutFormatter<T, kConvertibleToInteger> {
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// pointer, when the user doesn't define PrintTo() for it. (A member
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public:
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// variable pointer or member function pointer doesn't really point to
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// Since T has no << operator or PrintTo() but can be implicitly
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// a location in the address space. Their representation is
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// converted to BiggestInt, we print it as a BiggestInt.
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// implementation-defined. Therefore they will be printed as raw
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//
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// bytes.)
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// Most likely T is an enum type (either named or unnamed), in which
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struct FunctionPointerPrinter {
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// case printing it as an integer is the desired behavior. In case
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template <typename T, typename = typename std::enable_if<
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// T is not an enum, printing it as an integer is the best we can do
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std::is_function<T>::value>::type>
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// given that it has no user-defined printer.
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static void PrintValue(T* p, ::std::ostream* os) {
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static void PrintValue(const T& value, ::std::ostream* os) {
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if (p == nullptr) {
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const internal::BiggestInt kBigInt = value;
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*os << "NULL";
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*os << kBigInt;
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} else {
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// T is a function type, so '*os << p' doesn't do what we want
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// (it just prints p as bool). We want to print p as a const
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// void*.
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*os << reinterpret_cast<const void*>(p);
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}
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}
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}
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};
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};
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#if GTEST_INTERNAL_HAS_STRING_VIEW
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struct PointerPrinter {
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template <typename T>
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template <typename T>
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class TypeWithoutFormatter<T, kConvertibleToStringView> {
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static void PrintValue(T* p, ::std::ostream* os) {
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public:
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if (p == nullptr) {
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// Since T has neither operator<< nor PrintTo() but can be implicitly
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*os << "NULL";
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// converted to absl::string_view, we print it as a absl::string_view
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} else {
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// (or std::string_view).
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// T is not a function type. We just call << to print p,
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//
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// relying on ADL to pick up user-defined << for their pointer
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// Note: the implementation is further below, as it depends on
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// types, if any.
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// internal::PrintTo symbol which is defined later in the file.
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*os << p;
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static void PrintValue(const T& value, ::std::ostream* os);
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}
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}
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};
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};
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#endif
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// Prints the given value to the given ostream. If the value is a
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namespace internal_stream {
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// protocol message, its debug string is printed; if it's an enum or
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// of a type implicitly convertible to BiggestInt, it's printed as an
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struct Sentinel;
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// integer; otherwise the bytes in the value are printed. This is
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template <typename Char, typename CharTraits, typename T>
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// what UniversalPrinter<T>::Print() does when it knows nothing about
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Sentinel* operator<<(::std::basic_ostream<Char, CharTraits>& os, const T& x);
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// type T and T has neither << operator nor PrintTo().
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// Check if the user has a user-defined operator<< for their type.
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//
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//
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// A user can override this behavior for a class type Foo by defining
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// We put this in its own namespace to inject a custom operator<< that allows us
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// a << operator in the namespace where Foo is defined.
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// to probe the type's operator.
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//
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// We put this operator in namespace 'internal2' instead of 'internal'
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// to simplify the implementation, as much code in 'internal' needs to
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// use << in STL, which would conflict with our own << were it defined
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// in 'internal'.
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//
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//
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// Note that this operator<< takes a generic std::basic_ostream<Char,
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// Note that this operator<< takes a generic std::basic_ostream<Char,
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// CharTraits> type instead of the more restricted std::ostream. If
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// CharTraits> type instead of the more restricted std::ostream. If
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@ -229,67 +214,105 @@ class TypeWithoutFormatter<T, kConvertibleToStringView> {
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// operator<<(std::ostream&, const T&) or
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// operator<<(std::ostream&, const T&) or
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// operator<<(std::basic_stream<Char, CharTraits>, const Foo&) is more
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// operator<<(std::basic_stream<Char, CharTraits>, const Foo&) is more
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// specific.
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// specific.
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template <typename Char, typename CharTraits, typename T>
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::std::basic_ostream<Char, CharTraits>& operator<<(
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::std::basic_ostream<Char, CharTraits>& os, const T& x) {
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TypeWithoutFormatter<T, (internal::IsAProtocolMessage<T>::value
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? kProtobuf
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: std::is_convertible<
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const T&, internal::BiggestInt>::value
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? kConvertibleToInteger
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:
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#if GTEST_INTERNAL_HAS_STRING_VIEW
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std::is_convertible<
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const T&, internal::StringView>::value
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? kConvertibleToStringView
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:
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#endif
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kOtherType)>::PrintValue(x, &os);
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return os;
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}
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} // namespace internal2
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} // namespace testing
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// This namespace MUST NOT BE NESTED IN ::testing, or the name look-up
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// magic needed for implementing UniversalPrinter won't work.
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namespace testing_internal {
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// Used to print a value that is not an STL-style container when the
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// user doesn't define PrintTo() for it.
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template <typename T>
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template <typename T>
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void DefaultPrintNonContainerTo(const T& value, ::std::ostream* os) {
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constexpr bool UseStreamOperator() {
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// With the following statement, during unqualified name lookup,
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return !std::is_same<decltype(std::declval<std::ostream&>()
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// testing::internal2::operator<< appears as if it was declared in
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<< std::declval<const T&>()),
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// the nearest enclosing namespace that contains both
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Sentinel*>::value;
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// ::testing_internal and ::testing::internal2, i.e. the global
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// namespace. For more details, refer to the C++ Standard section
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// 7.3.4-1 [namespace.udir]. This allows us to fall back onto
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// testing::internal2::operator<< in case T doesn't come with a <<
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// operator.
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using ::testing::internal2::operator<<;
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// Assuming T is defined in namespace foo, in the next statement,
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// the compiler will consider all of:
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//
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// 1. foo::operator<< (thanks to Koenig look-up),
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// 2. ::operator<< (as the current namespace is enclosed in ::),
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// 3. testing::internal2::operator<< (thanks to the using statement above).
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//
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// The operator<< whose type matches T best will be picked.
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//
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// We deliberately allow #2 to be a candidate, as sometimes it's
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// impossible to define #1 (e.g. when foo is ::std, defining
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// anything in it is undefined behavior unless you are a compiler
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// vendor.).
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*os << value;
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}
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}
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} // namespace testing_internal
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} // namespace internal_stream
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namespace testing {
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struct StreamPrinter {
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namespace internal {
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template <typename T, typename = typename std::enable_if<
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internal_stream::UseStreamOperator<T>()>::type>
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static void PrintValue(const T& value, ::std::ostream* os) {
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*os << value;
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}
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};
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struct ProtobufPrinter {
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// We print a protobuf using its ShortDebugString() when the string
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// doesn't exceed this many characters; otherwise we print it using
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// DebugString() for better readability.
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static const size_t kProtobufOneLinerMaxLength = 50;
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template <typename T, typename = typename std::enable_if<
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internal::IsAProtocolMessage<T>::value>::type>
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static void PrintValue(const T& value, ::std::ostream* os) {
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std::string pretty_str = value.ShortDebugString();
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if (pretty_str.length() > kProtobufOneLinerMaxLength) {
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pretty_str = "\n" + value.DebugString();
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}
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*os << ("<" + pretty_str + ">");
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}
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};
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struct ConvertibleToIntegerPrinter {
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// Since T has no << operator or PrintTo() but can be implicitly
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// converted to BiggestInt, we print it as a BiggestInt.
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//
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// Most likely T is an enum type (either named or unnamed), in which
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// case printing it as an integer is the desired behavior. In case
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// T is not an enum, printing it as an integer is the best we can do
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// given that it has no user-defined printer.
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static void PrintValue(internal::BiggestInt value, ::std::ostream* os) {
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*os << value;
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}
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};
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struct ConvertibleToStringViewPrinter {
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#if GTEST_INTERNAL_HAS_STRING_VIEW
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static void PrintValue(internal::StringView value, ::std::ostream* os) {
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internal::UniversalPrint(value, os);
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}
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#endif
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};
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// Prints the given number of bytes in the given object to the given
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// ostream.
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GTEST_API_ void PrintBytesInObjectTo(const unsigned char* obj_bytes,
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size_t count,
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::std::ostream* os);
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struct FallbackPrinter {
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template <typename T>
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static void PrintValue(const T& value, ::std::ostream* os) {
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PrintBytesInObjectTo(
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static_cast<const unsigned char*>(
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reinterpret_cast<const void*>(std::addressof(value))),
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sizeof(value), os);
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}
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};
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// Try every printer in order and return the first one that works.
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template <typename T, typename E, typename Printer, typename... Printers>
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struct FindFirstPrinter : FindFirstPrinter<T, E, Printers...> {};
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template <typename T, typename Printer, typename... Printers>
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struct FindFirstPrinter<
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T, decltype(Printer::PrintValue(std::declval<const T&>(), nullptr)),
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Printer, Printers...> {
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using type = Printer;
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};
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// Select the best printer in the following order:
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// - Print containers (they have begin/end/etc).
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// - Print function pointers.
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// - Print object pointers.
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// - Use the stream operator, if available.
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// - Print protocol buffers.
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// - Print types convertible to BiggestInt.
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// - Print types convertible to StringView, if available.
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// - Fallback to printing the raw bytes of the object.
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template <typename T>
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void PrintWithFallback(const T& value, ::std::ostream* os) {
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using Printer = typename FindFirstPrinter<
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T, void, ContainerPrinter, FunctionPointerPrinter, PointerPrinter,
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StreamPrinter, ProtobufPrinter, ConvertibleToIntegerPrinter,
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ConvertibleToStringViewPrinter, FallbackPrinter>::type;
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Printer::PrintValue(value, os);
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}
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// FormatForComparison<ToPrint, OtherOperand>::Format(value) formats a
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// FormatForComparison<ToPrint, OtherOperand>::Format(value) formats a
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// value of type ToPrint that is an operand of a comparison assertion
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// value of type ToPrint that is an operand of a comparison assertion
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@ -388,85 +411,6 @@ std::string FormatForComparisonFailureMessage(
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template <typename T>
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template <typename T>
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class UniversalPrinter;
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class UniversalPrinter;
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template <typename T>
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void UniversalPrint(const T& value, ::std::ostream* os);
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enum DefaultPrinterType {
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kPrintContainer,
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kPrintPointer,
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kPrintFunctionPointer,
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kPrintOther,
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};
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template <DefaultPrinterType type> struct WrapPrinterType {};
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// Used to print an STL-style container when the user doesn't define
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// a PrintTo() for it.
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template <typename C>
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void DefaultPrintTo(WrapPrinterType<kPrintContainer> /* dummy */,
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const C& container, ::std::ostream* os) {
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const size_t kMaxCount = 32; // The maximum number of elements to print.
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*os << '{';
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size_t count = 0;
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for (typename C::const_iterator it = container.begin();
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it != container.end(); ++it, ++count) {
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if (count > 0) {
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*os << ',';
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if (count == kMaxCount) { // Enough has been printed.
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*os << " ...";
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break;
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}
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}
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*os << ' ';
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// We cannot call PrintTo(*it, os) here as PrintTo() doesn't
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// handle *it being a native array.
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internal::UniversalPrint(*it, os);
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}
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if (count > 0) {
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*os << ' ';
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}
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*os << '}';
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}
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// Used to print a pointer that is neither a char pointer nor a member
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// pointer, when the user doesn't define PrintTo() for it. (A member
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// variable pointer or member function pointer doesn't really point to
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|
||||||
// a location in the address space. Their representation is
|
|
||||||
// implementation-defined. Therefore they will be printed as raw
|
|
||||||
// bytes.)
|
|
||||||
template <typename T>
|
|
||||||
void DefaultPrintTo(WrapPrinterType<kPrintPointer> /* dummy */,
|
|
||||||
T* p, ::std::ostream* os) {
|
|
||||||
if (p == nullptr) {
|
|
||||||
*os << "NULL";
|
|
||||||
} else {
|
|
||||||
// T is not a function type. We just call << to print p,
|
|
||||||
// relying on ADL to pick up user-defined << for their pointer
|
|
||||||
// types, if any.
|
|
||||||
*os << p;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
template <typename T>
|
|
||||||
void DefaultPrintTo(WrapPrinterType<kPrintFunctionPointer> /* dummy */,
|
|
||||||
T* p, ::std::ostream* os) {
|
|
||||||
if (p == nullptr) {
|
|
||||||
*os << "NULL";
|
|
||||||
} else {
|
|
||||||
// T is a function type, so '*os << p' doesn't do what we want
|
|
||||||
// (it just prints p as bool). We want to print p as a const
|
|
||||||
// void*.
|
|
||||||
*os << reinterpret_cast<const void*>(p);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// Used to print a non-container, non-pointer value when the user
|
|
||||||
// doesn't define PrintTo() for it.
|
|
||||||
template <typename T>
|
|
||||||
void DefaultPrintTo(WrapPrinterType<kPrintOther> /* dummy */,
|
|
||||||
const T& value, ::std::ostream* os) {
|
|
||||||
::testing_internal::DefaultPrintNonContainerTo(value, os);
|
|
||||||
}
|
|
||||||
|
|
||||||
// Prints the given value using the << operator if it has one;
|
// Prints the given value using the << operator if it has one;
|
||||||
// otherwise prints the bytes in it. This is what
|
// otherwise prints the bytes in it. This is what
|
||||||
// UniversalPrinter<T>::Print() does when PrintTo() is not specialized
|
// UniversalPrinter<T>::Print() does when PrintTo() is not specialized
|
||||||
@ -480,36 +424,7 @@ void DefaultPrintTo(WrapPrinterType<kPrintOther> /* dummy */,
|
|||||||
// wants).
|
// wants).
|
||||||
template <typename T>
|
template <typename T>
|
||||||
void PrintTo(const T& value, ::std::ostream* os) {
|
void PrintTo(const T& value, ::std::ostream* os) {
|
||||||
// DefaultPrintTo() is overloaded. The type of its first argument
|
internal::PrintWithFallback(value, os);
|
||||||
// determines which version will be picked.
|
|
||||||
//
|
|
||||||
// Note that we check for container types here, prior to we check
|
|
||||||
// for protocol message types in our operator<<. The rationale is:
|
|
||||||
//
|
|
||||||
// For protocol messages, we want to give people a chance to
|
|
||||||
// override Google Mock's format by defining a PrintTo() or
|
|
||||||
// operator<<. For STL containers, other formats can be
|
|
||||||
// incompatible with Google Mock's format for the container
|
|
||||||
// elements; therefore we check for container types here to ensure
|
|
||||||
// that our format is used.
|
|
||||||
//
|
|
||||||
// Note that MSVC and clang-cl do allow an implicit conversion from
|
|
||||||
// pointer-to-function to pointer-to-object, but clang-cl warns on it.
|
|
||||||
// So don't use ImplicitlyConvertible if it can be helped since it will
|
|
||||||
// cause this warning, and use a separate overload of DefaultPrintTo for
|
|
||||||
// function pointers so that the `*os << p` in the object pointer overload
|
|
||||||
// doesn't cause that warning either.
|
|
||||||
DefaultPrintTo(
|
|
||||||
WrapPrinterType <
|
|
||||||
(sizeof(IsContainerTest<T>(0)) == sizeof(IsContainer)) &&
|
|
||||||
!IsRecursiveContainer<T>::value
|
|
||||||
? kPrintContainer
|
|
||||||
: !std::is_pointer<T>::value
|
|
||||||
? kPrintOther
|
|
||||||
: std::is_function<typename std::remove_pointer<T>::type>::value
|
|
||||||
? kPrintFunctionPointer
|
|
||||||
: kPrintPointer > (),
|
|
||||||
value, os);
|
|
||||||
}
|
}
|
||||||
|
|
||||||
// The following list of PrintTo() overloads tells
|
// The following list of PrintTo() overloads tells
|
||||||
@ -900,16 +815,6 @@ Strings UniversalTersePrintTupleFieldsToStrings(const Tuple& value) {
|
|||||||
|
|
||||||
} // namespace internal
|
} // namespace internal
|
||||||
|
|
||||||
#if GTEST_INTERNAL_HAS_STRING_VIEW
|
|
||||||
namespace internal2 {
|
|
||||||
template <typename T>
|
|
||||||
void TypeWithoutFormatter<T, kConvertibleToStringView>::PrintValue(
|
|
||||||
const T& value, ::std::ostream* os) {
|
|
||||||
internal::PrintTo(internal::StringView(value), os);
|
|
||||||
}
|
|
||||||
} // namespace internal2
|
|
||||||
#endif
|
|
||||||
|
|
||||||
template <typename T>
|
template <typename T>
|
||||||
::std::string PrintToString(const T& value) {
|
::std::string PrintToString(const T& value) {
|
||||||
::std::stringstream ss;
|
::std::stringstream ss;
|
||||||
|
|||||||
@ -104,7 +104,7 @@ void PrintBytesInObjectToImpl(const unsigned char* obj_bytes, size_t count,
|
|||||||
|
|
||||||
} // namespace
|
} // namespace
|
||||||
|
|
||||||
namespace internal2 {
|
namespace internal {
|
||||||
|
|
||||||
// Delegates to PrintBytesInObjectToImpl() to print the bytes in the
|
// Delegates to PrintBytesInObjectToImpl() to print the bytes in the
|
||||||
// given object. The delegation simplifies the implementation, which
|
// given object. The delegation simplifies the implementation, which
|
||||||
@ -116,10 +116,6 @@ void PrintBytesInObjectTo(const unsigned char* obj_bytes, size_t count,
|
|||||||
PrintBytesInObjectToImpl(obj_bytes, count, os);
|
PrintBytesInObjectToImpl(obj_bytes, count, os);
|
||||||
}
|
}
|
||||||
|
|
||||||
} // namespace internal2
|
|
||||||
|
|
||||||
namespace internal {
|
|
||||||
|
|
||||||
// Depending on the value of a char (or wchar_t), we print it in one
|
// Depending on the value of a char (or wchar_t), we print it in one
|
||||||
// of three formats:
|
// of three formats:
|
||||||
// - as is if it's a printable ASCII (e.g. 'a', '2', ' '),
|
// - as is if it's a printable ASCII (e.g. 'a', '2', ' '),
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user