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std::experimental::ranges::greater

From cppreference.com
< cpp‎ | experimental‎ | ranges
 
 
Technical specifications
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals 2 TS)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Concepts (concepts TS)
Ranges (ranges TS)
Mathematical special functions (special functions TR)
 
 
General utilities library
Utility components
Function objects
greater
Metaprogramming and type traits
Tagged pairs and tuples
                                        
                                        
                                        
                                        
 
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.

Contents

[edit] Member types

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

[edit] 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));.

[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]