rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags > Class Template Reference

JSON writer. More...

#include <writer.h>

Classes
struct	Level
	Information for each nested level. More...

Public Types
typedef SourceEncoding::Ch	Ch

Public Member Functions
	Writer (OutputStream &os, StackAllocator *stackAllocator=0, size_t levelDepth=kDefaultLevelDepth)
	Constructor. More...
	Writer (StackAllocator *allocator=0, size_t levelDepth=kDefaultLevelDepth)
void	Reset (OutputStream &os)
	Reset the writer with a new stream. More...
bool	IsComplete () const
	Checks whether the output is a complete JSON. More...
int	GetMaxDecimalPlaces () const
void	SetMaxDecimalPlaces (int maxDecimalPlaces)
	Sets the maximum number of decimal places for double output. More...
Implementation of Handler
See also Handler
bool	Null ()
bool	Bool (bool b)
bool	Int (int i)
bool	Uint (unsigned u)
bool	Int64 (int64_t i64)
bool	Uint64 (uint64_t u64)
bool	Double (double d)
	Writes the given double value to the stream. More...
bool	RawNumber (const Ch *str, SizeType length, bool copy=false)
bool	String (const Ch *str, SizeType length, bool copy=false)
bool	String (const std::basic_string< Ch > &str)
bool	StartObject ()
bool	Key (const Ch *str, SizeType length, bool copy=false)
bool	EndObject (SizeType memberCount=0)
bool	StartArray ()
bool	EndArray (SizeType elementCount=0)

Static Public Attributes
static const int	kDefaultMaxDecimalPlaces = 324

Protected Member Functions
bool	WriteInt (int i)
bool	WriteUint (unsigned u)
bool	WriteInt64 (int64_t i64)
bool	WriteUint64 (uint64_t u)
bool	WriteDouble (double d)

Convenience extensions
static const size_t	kDefaultLevelDepth = 32
OutputStream *	os_
internal::Stack< StackAllocator >	level_stack_
int	maxDecimalPlaces_
bool	hasRoot_
bool	String (const Ch *str)
	Simpler but slower overload.
bool	Key (const Ch *str)
bool	RawValue (const Ch *json, size_t length, Type type)
	Write a raw JSON value. More...
bool	WriteNull ()
bool	WriteBool (bool b)
bool	WriteInt (int i)
bool	WriteUint (unsigned u)
bool	WriteInt64 (int64_t i64)
bool	WriteUint64 (uint64_t u64)
bool	WriteDouble (double d)
bool	WriteString (const Ch *str, SizeType length)
bool	ScanWriteUnescapedString (GenericStringStream< SourceEncoding > &is, size_t length)
bool	WriteStartObject ()
bool	WriteEndObject ()
bool	WriteStartArray ()
bool	WriteEndArray ()
bool	WriteRawValue (const Ch *json, size_t length)
void	Prefix (Type type)
bool	EndValue (bool ret)

Detailed Description

template<typename OutputStream, typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>
class rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >

JSON writer.

Writer implements the concept Handler. It generates JSON text by events to an output os.

User may programmatically calls the functions of a writer to generate JSON text.

On the other side, a writer can also be passed to objects that generates events,

for example Reader::Parse() and Document::Accept().

Template Parameters

OutputStream	Type of output stream.
SourceEncoding	Encoding of source string.
TargetEncoding	Encoding of output stream.
StackAllocator	Type of allocator for allocating memory of stack.

Note

implements Handler concept

Constructor & Destructor Documentation

Writer()

template<typename OutputStream , typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>

rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >::Writer ( OutputStream &  os, StackAllocator *  stackAllocator = 0, size_t  levelDepth = kDefaultLevelDepth  )

inlineexplicit

Constructor.

Parameters

os	Output stream.
stackAllocator	User supplied allocator. If it is null, it will create a private one.
levelDepth	Initial capacity of stack.

Member Function Documentation

Double()

template<typename OutputStream , typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>

bool rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >::Double ( double  d )

inline

Writes the given double value to the stream.

Parameters

d	The value to be written.

Returns

Whether it is succeed.

IsComplete()

template<typename OutputStream , typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>

bool rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >::IsComplete ( ) const

inline

Checks whether the output is a complete JSON.

A complete JSON has a complete root object or array.

RawValue()

template<typename OutputStream , typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>

bool rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >::RawValue ( const Ch *  json, size_t  length, Type  type  )

inline

Write a raw JSON value.

For user to write a stringified JSON as a value.

Parameters

json	A well-formed JSON value. It should not contain null character within [0, length - 1] range.
length	Length of the json.
type	Type of the root of json.

Reset()

template<typename OutputStream , typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>

void rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >::Reset ( OutputStream &  os )

inline

Reset the writer with a new stream.

This function reset the writer with a new stream and default settings, in order to make a Writer object reusable for output multiple JSONs.

Parameters

os	New output stream. Writer<OutputStream> writer(os1); writer.StartObject(); // ... writer.EndObject(); writer.Reset(os2); writer.StartObject(); // ... writer.EndObject();

SetMaxDecimalPlaces()

template<typename OutputStream , typename SourceEncoding = UTF8<>, typename TargetEncoding = UTF8<>, typename StackAllocator = CrtAllocator, unsigned writeFlags = kWriteDefaultFlags>

void rapidjson::Writer< OutputStream, SourceEncoding, TargetEncoding, StackAllocator, writeFlags >::SetMaxDecimalPlaces ( int  maxDecimalPlaces )

inline

Sets the maximum number of decimal places for double output.

This setting truncates the output with specified number of decimal places.

For example,

writer.SetMaxDecimalPlaces(3);
writer.StartArray();
writer.Double(0.12345);                 // "0.123"
writer.Double(0.0001);                  // "0.0"
writer.Double(1.234567890123456e30);    // "1.234567890123456e30" (do not truncate significand for positive exponent)
writer.Double(1.23e-4);                 // "0.0"                  (do truncate significand for negative exponent)
writer.EndArray();

The default setting does not truncate any decimal places. You can restore to this setting by calling

writer.SetMaxDecimalPlaces(Writer::kDefaultMaxDecimalPlaces);

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The documentation for this class was generated from the following files:

• include/rapidjson/fwd.h
• include/rapidjson/writer.h