std::plus - cppreference.com (original) (raw)
| Defined in header | | | | -------------------------------------------------------------------------------------- | | ------------- | | template< class T > struct plus; | | (until C++14) | | template< class T = void > struct plus; | | (since C++14) |
Function object for performing addition. Effectively calls operator+ on two instances of type T.
Contents
[edit] Specializations
| The standard library provides a specialization of std::plus when T is not specified, which leaves the parameter types and return type to be deduced. function object implementing x + y deducing parameter and return types (class template specialization) [edit] | (since C++14) |
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[edit] Member types
| Type | Definition |
|---|---|
| result_type (deprecated in C++17)(removed in C++20) | T |
| first_argument_type (deprecated in C++17)(removed in C++20) | T |
| second_argument_type (deprecated in C++17)(removed in C++20) | T |
| These member types are obtained via publicly inheriting std::binary_function<T, T, T>. | (until C++11) |
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[edit] Member functions
| | returns the sum of two arguments (public member function) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
std:➕:operator()
| T operator()( const T& lhs, const T& rhs ) const; | | (constexpr since C++14) | | ------------------------------------------------- | | ----------------------- |
Returns the sum of lhs and rhs.
Parameters
Return value
The result of lhs + rhs.
[edit] Exceptions
May throw implementation-defined exceptions.
Possible implementation
constexpr T operator()(const T& lhs, const T& rhs) const { return lhs + rhs; }