std::greater

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

Function object for performing comparisons. The main template invokes operator> on type T.

(C++14)

function object implementing x > y deducing argument and return types
(class template specialization)

Type	Definition
`result_type` (deprecated in C++17)(removed in C++20)	bool
`first_argument_type` (deprecated in C++17)(removed in C++20)	`T`
`second_argument_type` (deprecated in C++17)(removed in C++20)	`T`

These member types are obtained via publicly inheriting std::binary_function<T, T, bool>.

(until C++11)

operator()

checks whether the first argument is greater than the second
(public member function)

std::greater::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 rhs.

lhs, rhs

values to compare

lhs > rhs.

If T is a pointer type, the result is consistent with the implementation-defined strict total order over pointers.

May throw implementation-defined exceptions.

constexpr bool operator()(const T& lhs, const T& rhs) const 
{
    return lhs > rhs; // assumes that the implementation handles pointer total order
}

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR	Applied to	Behavior as published	Correct behavior
LWG 2562	C++98	the pointer total order might be inconsistent	guaranteed to be consistent

less	function object implementing `x < y` (class template)
ranges::greater (C++20)	function object implementing `x > y` (class)