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set output stream in write(), not in builder

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This commit is contained in:
Christopher Dunn
2015-02-09 18:44:53 -06:00
parent b56381a636
commit c41609b9f9
2 changed files with 51 additions and 68 deletions
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37
include/json/writer.h
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@@ -31,15 +31,15 @@ Usage:
using namespace Json;
void writeToStdout(StreamWriter::Factory const& factory, Value const& value) {
std::unique_ptr<StreamWriter> const writer(
factory.newStreamWriter(&std::cout));
writer->write(value);
factory.newStreamWriter());
writer->write(value, &std::cout);
std::cout << std::endl; // add lf and flush
}
\endcode
*/
class JSON_API StreamWriter {
protected:
std::ostream& sout_; // not owned; will not delete
std::ostream* sout_; // not owned; will not delete
public:
/// Scoped enums are not available until C++11.
struct CommentStyle {
@@ -51,13 +51,15 @@ public:
};
};
/// Keep a reference, but do not take ownership of `sout`.
StreamWriter(std::ostream* sout);
StreamWriter();
virtual ~StreamWriter();
/// Write Value into document as configured in sub-class.
/// \return zero on success
/// \throw std::exception possibly, depending on configuration
virtual int write(Value const& root) = 0;
/** Write Value into document as configured in sub-class.
Do not take ownership of sout, but maintain a reference during function.
\pre sout != NULL
\return zero on success
\throw std::exception possibly, depending on configuration
*/
virtual int write(Value const& root, std::ostream* sout) = 0;
/** \brief A simple abstract factory.
*/
@@ -65,10 +67,9 @@ public:
public:
virtual ~Factory();
/** \brief Allocate a CharReader via operator new().
* Do not take ownership of sout, but maintain a reference.
* \throw std::exception if something goes wrong (e.g. invalid settings)
*/
virtual StreamWriter* newStreamWriter(std::ostream* sout) const = 0;
virtual StreamWriter* newStreamWriter() const = 0;
}; // Factory
}; // StreamWriter
@@ -88,8 +89,8 @@ Usage:
builder.settings_["commentStyle"] = "None";
builder.settings_["indentation"] = " "; // or whatever you like
std::unique_ptr<Json::StreamWriter> writer(
builder.newStreamWriter(&std::cout));
writer->write(value);
builder.newStreamWriter());
writer->write(value, &std::cout);
std::cout << std::endl; // add lf and flush
\endcode
*/
@@ -112,10 +113,10 @@ public:
StreamWriterBuilder();
virtual ~StreamWriterBuilder();
/** Do not take ownership of sout, but maintain a reference.
/**
* \throw std::exception if something goes wrong (e.g. invalid settings)
*/
virtual StreamWriter* newStreamWriter(std::ostream* sout) const;
virtual StreamWriter* newStreamWriter() const;
/** \return true if 'settings' are legal and consistent;
* otherwise, indicate bad settings via 'invalid'.
@@ -137,8 +138,8 @@ public:
* \code
* OldCompressingStreamWriterBuilder b;
* b.dropNullPlaceHolders_ = true; // etc.
* StreamWriter* w = b.newStreamWriter(&std::cout);
* w->write(value);
* StreamWriter* w = b.newStreamWriter();
* w->write(value, &std::cout);
* delete w;
* \endcode
*
@@ -174,7 +175,7 @@ public:
, omitEndingLineFeed_(false)
, enableYAMLCompatibility_(false)
{}
virtual StreamWriter* newStreamWriter(std::ostream*) const;
virtual StreamWriter* newStreamWriter() const;
};
/** \brief Abstract class for writers.