std::less_equal

C++

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Defined in header <functional>
template< class T > struct less_equal;		(until C++14)
template< class T = void > struct less_equal;		(since C++14)

Function object for performing comparisons. Unless specialized, invokes operator<= on type T.

Specializations

A specialization of std::less_equal for any pointer type yields a strict total order, even if the built-in operator<= does not. The strict total order is consistent among specializations of std::less, std::greater, std::less_equal, and std::greater_equal for that pointer type, and is also consistent with the partial order imposed by the corresponding built-in operators (<, >, <= and >=).

If the function call operator of the specialization std::less_equal<void> calls a built-in operator comparing pointers, it yields a strict total order even if the built-in operator<= does not. This strict total order is consistent among the specializations std::less<void>, std::greater<void>, std::less_equal<void>, and std::greater_equal<void>, and is also consistent with the partial order imposed by the corresponding built-in operators.

(since C++14)

The standard library provides a specialization of std::less_equal when T is not specified, which leaves the parameter types and return type to be deduced. less_equal<void> function object implementing x <= y deducing argument and return types (class template specialization)

(since C++14)

Member types Type Definition result_type(deprecated in C++17) bool first_argument_type(deprecated in C++17) T second_argument_type(deprecated in C++17) T

(until C++20)

Member functions

operator()

checks if the first argument is less than or equal to the second (public member function)

std::less_equal::operator()

bool operator()( const T& lhs, const T& rhs ) const;		(until C++14)
constexpr bool operator()( const T& lhs, const T& rhs ) const;		(since C++14)

Checks if lhs is less than or equal to rhs.

Parameters

lhs, rhs

-

values to compare

Return value

true if lhs <= rhs, false otherwise.

Exceptions

(none)

Possible implementation

constexpr bool operator()(const T &lhs, const T &rhs) const { return lhs <= rhs; }