std::plus<void>
Defined in header <functional> | ||
|---|---|---|
template<> class plus<void>; | (since C++14) |
std::plus<void> is a specialization of std::plus with parameter and return type deduced.
Nested types
| Nested type | Definition |
|---|---|
is_transparent | unspecified |
Member functions
| operator() | returns the sum of two arguments (public member function) |
std::plus<void>::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
| lhs, rhs | - | values to sum |
Return value
std::forward<T>(lhs) + std::forward<U>(rhs).
Example
#include <functional>
#include <iostream>
int main()
{
auto string_plus = std::plus<void>{}; // “void” can be omitted
std::string a = "Hello ";
const char* b = "world";
std::cout << string_plus(a, b) << '\n';
}Output:
Hello world
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