wamp::Null Struct Reference

Type used to represent a null or empty Variant value. More...

#include <cppwamp/null.hpp>

Public Member Functions
constexpr	Null ()=default
	Default constructor for instantiating constexpr object.
bool	operator== (Null) const
	Compares two Null objects for equality. More...
bool	operator!= (Null) const
	Compares two Null objects for inequality. More...
bool	operator< (Null) const
	Performs less-than comparison on two Null objects. More...

Related Functions
(Note that these are not member functions.)
std::ostream &	operator<< (std::ostream &out, Null)

Detailed Description

Type used to represent a null or empty Variant value.

The wamp::null constant should be used to nullify a Variant, and for checking if a Variant is empty:

using namespace wamp;
Variant v(42); // v contains an integer
v = null; // v is now empty
 
// Check if v is null
if (v == null)
    std::cout << "v is empty\n";

See also

wamp::null

Member Function Documentation

operator==()

bool wamp::Null::operator== ( Null  ) const

inline

Compares two Null objects for equality.

Returns

always true.

operator!=()

bool wamp::Null::operator!= ( Null  ) const

inline

Compares two Null objects for inequality.

Returns

always false.

operator<()

bool wamp::Null::operator< ( Null  ) const

inline

Performs less-than comparison on two Null objects.

Returns

always false.

Friends And Related Function Documentation

operator<<()

std::ostream & operator<< ( std::ostream &  out, Null    )

related

Outputs a Null object to the given output stream. The string "null" (without the quotes) will be outputted.

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The documentation for this struct was generated from the following file:

• cppwamp/null.hpp