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

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

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

Contents

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

[edit] Member types

[edit] Member functions

| | returns the sum of two arguments (public member function) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

std::plus::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 sum of lhs and rhs.

Parameters

Return value

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

[edit] Example

#include #include   int main() { auto string_plus = std::plus{}; // “void” can be omitted std::string a = "Hello "; const char* b = "world"; std::cout << string_plus(a, b) << '\n'; }

Output: