Wt::Json::Object Class Reference

A JSON object. More...

Inherits std::map< K, T >.

Public Member Functions
	Object ()
	Default constructor.
	Object (const Object &other)
	Copy constructor.
void	swap (Object &other)
	Swap operation. More...
Object &	operator= (const Object &other)
	Assignment operator.
std::set< std::string >	names () const
	Returns the key set. More...
bool	contains (const std::string &name) const
	Returns whether a member exists. More...
Type	type (const std::string &name) const
	Returns the type of a given member. More...
bool	isNull (const std::string &name) const
	Returns whether the value for a member is null (or not defined). More...
const Value &	get (const std::string &name) const
	Returns the value for a member (or null if not defined). More...

Static Public Attributes
static Object	Empty
	Empty object constant.

Detailed Description

A JSON object.

This class represents a JSON object, which defines a value map. It is implemented as a std::map<std::string,Json::Value>. It is therefore possible to use the std::map API to deal with it.

However, a number of additional methods have been added to more conveniently query the existence and the type of contained objects. A get() method can be used to return a member value, which returns Value::Null if the member is not defined.

Member Function Documentation

bool Wt::Json::Object::contains

(

const std::string &

name

)

const

Returns whether a member exists.

This returns whether the name is in the names() set.

const Value & Wt::Json::Object::get

(

const std::string &

name

)

const

Returns the value for a member (or null if not defined).

Returns the value associated with member name or null if no value has been associated with this member name.

bool Wt::Json::Object::isNull

(

const std::string &

name

)

const

Returns whether the value for a member is null (or not defined).

See also

get(), Value::isNull()

std::set< std::string > Wt::Json::Object::names

(

)

const

Returns the key set.

This returns the member names: these are the members for which values have been associated in this object.

Note

This may include members with explicit Value::Null values.

void Wt::Json::Object::swap

(

Object &

other

)

Swap operation.

This swaps the contents of two objects.

Type Wt::Json::Object::type

(

const std::string &

name

)

const

Returns the type of a given member.

This method returns the type of the value for members that are included, or returns Json::NullType for when no value is associated with name.