[Home]logical_not

Synopsis

template< 
      typename F
    >
struct logical_not
{
    typedef unspecified type;
};

Description

Returns the result of logical not (!) operation on its argument.

Definition

#include "boost/mpl/logical/not.hpp"

Parameters

 Parameter  Requirement  Description  
FA model of nullary Metafunction

Expression semantics

 Expression  Expression type  Precondition  Semantics  Postcondition 
typedef logical_not<f>::type c;A model of bool Integral ConstantEquivalent to typedef bool_c<(!f::type::value)> c;

Example

BOOST_STATIC_ASSERT(logical_not<true_c>::type::value == false);
BOOST_STATIC_ASSERT(logical_not<false_c>::type::value == true);

See also

Metafunctions, logical_and, logical_or


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Last edited July 17, 2002 4:13 am