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specialize UniversalPrinter<> for std::optional

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This commit is contained in:
Krystian Kuzniarek 2020-03-07 15:48:20 +01:00
parent 33b44c4b35
commit 95b0ea2cf5
3 changed files with 42 additions and 13 deletions
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11
googletest/include/gtest/gtest-printers.h
View File

@ -113,7 +113,6 @@
#if GTEST_HAS_ABSL
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#endif // GTEST_HAS_ABSL
namespace testing {
@ -680,14 +679,14 @@ class UniversalPrinter {
GTEST_DISABLE_MSC_WARNINGS_POP_()
};
#if GTEST_HAS_ABSL
#if GTEST_INTERNAL_HAS_OPTIONAL
// Printer for absl::optional
// Printer for std::optional / absl::optional
template <typename T>
class UniversalPrinter<::absl::optional<T>> {
class UniversalPrinter<Optional<T>> {
public:
static void Print(const ::absl::optional<T>& value, ::std::ostream* os) {
static void Print(const Optional<T>& value, ::std::ostream* os) {
*os << '(';
if (!value) {
*os << "nullopt";
@ -698,7 +697,7 @@ class UniversalPrinter<::absl::optional<T>> {
}
};
#endif // GTEST_HAS_ABSL
#endif // GTEST_INTERNAL_HAS_OPTIONAL
#if GTEST_INTERNAL_HAS_VARIANT

32
googletest/include/gtest/internal/gtest-port.h
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@ -199,6 +199,8 @@
// suppressed (constant conditional).
// GTEST_INTENTIONAL_CONST_COND_POP_ - finish code section where MSVC C4127
// is suppressed.
// GTEST_INTERNAL_HAS_OPTIONAL - for enabling UniversalPrinter<std::optional> or
// UniversalPrinter<absl::optional> specializations.
// GTEST_INTERNAL_HAS_STRING_VIEW - for enabling Matcher<std::string_view> or
// Matcher<absl::string_view>
// specializations.
@ -2225,6 +2227,36 @@ const char* StringFromGTestEnv(const char* flag, const char* default_val);
#endif // !defined(GTEST_INTERNAL_DEPRECATED)
#if GTEST_HAS_ABSL
// Always use absl::optional for UniversalPrinter<> specializations if googletest
// is built with absl support.
# define GTEST_INTERNAL_HAS_OPTIONAL 1
#include "absl/types/optional.h"
namespace testing {
namespace internal {
template <typename T>
using Optional = ::absl::optional<T>;
} // namespace internal
} // namespace testing
#else
# ifdef __has_include
# if __has_include(<optional>) && __cplusplus >= 201703L
// Otherwise for C++17 and higher use std::optional for UniversalPrinter<>
// specializations.
# define GTEST_INTERNAL_HAS_OPTIONAL 1
#include <optional>
namespace testing {
namespace internal {
template <typename T>
using Optional = ::std::optional<T>;
} // namespace internal
} // namespace testing
// The case where absl is configured NOT to alias std::optional is not
// supported.
# endif // __has_include(<optional>) && __cplusplus >= 201703L
# endif // __has_include
#endif // GTEST_HAS_ABSL
#if GTEST_HAS_ABSL
// Always use absl::string_view for Matcher<> specializations if googletest
// is built with absl support.

12
googletest/test/googletest-printers-test.cc
View File

@ -1531,18 +1531,16 @@ TEST(UniversalTersePrintTupleFieldsToStringsTestWithStd, PrintsTersely) {
EXPECT_EQ("\"a\"", result[1]);
}
#if GTEST_HAS_ABSL
#if GTEST_INTERNAL_HAS_OPTIONAL
TEST(PrintOptionalTest, Basic) {
absl::optional<int> value;
internal::Optional<int> value;
EXPECT_EQ("(nullopt)", PrintToString(value));
value = {7};
EXPECT_EQ("(7)", PrintToString(value));
EXPECT_EQ("(1.1)", PrintToString(absl::optional<double>{1.1}));
EXPECT_EQ("(\"A\")", PrintToString(absl::optional<std::string>{"A"}));
EXPECT_EQ("(1.1)", PrintToString(internal::Optional<double>{1.1}));
EXPECT_EQ("(\"A\")", PrintToString(internal::Optional<std::string>{"A"}));
}
#endif // GTEST_HAS_ABSL
#endif // GTEST_INTERNAL_HAS_OPTIONAL
#if GTEST_INTERNAL_HAS_VARIANT
struct NonPrintable {