std::not_equal_to - cppreference.com (original) (raw)

| | | | | --------------------------------------- | | ------------- | | template<> class not_equal_to<void>; | | (since C++14) |

std::not_equal_to<void> is a specialization of std::not_equal_to with parameter and return type deduced.

Contents

• 1 Nested types
• 2 Member functions
• 3 std::not_equal_to::operator()
  • 3.1 Parameters
  • 3.2 Return value
  • 3.3 Example

[edit] Nested types

[edit] Member functions

| | tests if the two arguments do not compare equal (public member function) | | --------------------------------------------------------------------------- |

std::not_equal_to::operator()

| template< class T, class U > constexpr auto operator()( T&& lhs, U&& rhs ) const -> decltype(std::forward<T>(lhs) != std::forward<U>(rhs)); | | | | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | |

Returns the result of non-equality comparison between lhs and rhs.

Parameters

Return value

std::forward<T>(lhs) != std::forward<U>(rhs).

[edit] Example

#include   int main() { constexpr int p = 0, q = 8; std::not_equal_to<> not_equal{}; static_assert(!not_equal(p, p)); static_assert(not_equal(p, q)); }