std::experimental::ranges::greater - cppreference.com (original) (raw)

Defined in header <experimental/ranges/functional>
template< class T = void > requires StrictTotallyOrdered<T> | Same<T, void> /* < on two const T lvalues invokes a built-in operator comparing pointers */ struct greater;
template<> struct greater<void>; (ranges TS)

Function object for performing comparisons. The primary template invokes operator< on const lvalues of type T with the argument order inverted. The specialization greater<void> deduces the parameter types of the function call operator from the arguments (but not the return type).

All specializations of greater are Semiregular.

Contents

[edit] Member types

Member type Definition
is_transparent (member only of greater specialization) /* unspecified */

[edit] Member functions

| | checks if the first argument is greater than the second (public member function) | | ------------------------------------------------------------------------------------- |

std::experimental::ranges::greater::operator()

constexpr bool operator()(const T& x, const T& y) const; (1) (member only of primary greater template)
template< class T, class U > requires StrictTotallyOrderedWith<T, U> | /* std::declval() < std::declval() resolves to a built-in operator comparing pointers */ constexpr bool operator()(T&& t, U&& u) const; (2)
  1. Compares x and y. Equivalent to return ranges::less<>{}(y, x);.

[edit] Notes

Unlike std::greater, ranges::greater requires all six comparison operators <, <=, >, >=, == and != to be valid (via the StrictTotallyOrdered and StrictTotallyOrderedWith constraints) and is entirely defined in terms of ranges::less. However, the implementation is free to use operator> directly, because those concepts require the results of the comparison operators to be consistent.

[edit] Example

[edit] See also

| | function object implementing x > y (class template) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |