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std::greater_equal

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

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

Contents

[edit] Specializations

A specialization of std::greater_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::greater_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::greater_equal when T is not specified, which leaves the parameter types and return type to be deduced.

function object implementing x >= y deducing argument and return types
(class template specialization) [edit]
(since C++14)

[edit] 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

[edit] Member functions

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

std::greater_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 whether lhs is greater 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;
}