std::experimental::ranges::greater

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< cpp‎ | experimental‎ | ranges
 
 
Technical specifications
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Function objects
greater
Metaprogramming and type traits
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tag specifiers
                                      
                          
 
template< class T = void >

    requires StrictTotallyOrdered<T> ||
             Same<T, void> ||
             /* < on two const T lvalues invokes a built-in operator comparing pointers */

struct greater;
(ranges TS)
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.

Member types

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

Member functions

operator()
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<T> template)
template< class T, class U >

    requires StrictTotallyOrderedWith<T, U> ||
             /* std::declval<T>() < std::declval<U>() resolves to
                a built-in operator comparing pointers */

constexpr bool operator()(T&& t, U&& u) const;
(2) (member only of greater<void> specialization)
1) Compares x and y. Equivalent to return ranges::less<>{}(y, x);.
2) Compares t and u. Equivalent to return ranges::less<>{}(std::forward<U>(u), std::forward<T>(t));.

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.

Example

See also

function object implementing x > y
(class template)