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[Home]less

Synopsis

template<
      typename T1
    , typename T2
    >
struct less
{
    typedef unspecified type;
};

Description

Returns true_ if T1::value < T2::value and false_ otherwise [1].

Definition

#include "boost/mpl/less.hpp"

Parameters

 Parameter  Requirement  Description  
T1, T2A model of Integral Constant

Expression semantics

 Expression  Expression type  Precondition  Semantics  Postcondition 
typedef less<t1,t2>::type c;A model of bool Integral ConstantEquivalent to typedef bool_<(t1::value < t2::value)> c;

Complexity

Amortized constant time.

Example

typedef list_c<int,0,1,2,3,4,5,6,7,8,9> numbers;
typedef remove_if< numbers, less<_1,int_<5> > >::type result;
BOOST_STATIC_ASSERT(equal< result,range_c<int,5,10> >::type::value));

Notes

[1] The less metafunction can be (and is expected to be) specialized by user to work on user-defined types that do not satisfy the Integral Constant requirements. The requirements listed here are the ones imposed by the default implementation.

See also

Metafunctions, less_equal, greater, greater_equal, equal, not_equal_to


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Last edited March 10, 2003 6:22 am