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Showing content from https://en.cppreference.com/w/cpp/language/../error/../language/../utility/functional/greater.html below:

std::greater - cppreference.com

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.

[edit] Specializations function object implementing x > y deducing parameter and return types
(class template specialization) [edit] [edit] Member types 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) [edit] Member functions 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;

(constexpr since C++14)

Checks whether lhs is greater than rhs.

Parameters lhs, rhs - values to compare Return value

lhs > rhs.

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

[edit] Exceptions

May throw implementation-defined exceptions.

Possible implementation

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

[edit] Defect reports

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 [edit] See also

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