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      std::plus

      From cppreference.com
      <cpp‎ |utility‎ |functional
       
       
      Utilities library
       
      Function objects
      Function invocation
      (C++17)(C++23)
      Identity function object
      (C++20)
      Old binders and adaptors
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      Defined in header<functional>
      template<class T>
      struct plus;
      (until C++14)
      template<class T=void>
      struct plus;
      (since C++14)

      Function object for performing addition. Effectively callsoperator+ on two instances of typeT.

      Contents

      [edit]Specializations

      The standard library provides a specialization ofstd::plus whenT is not specified, which leaves the parameter types and return type to be deduced.

      (C++14)
      function object implementingx+ y deducing parameter and return types
      (class template specialization)[edit]
      (since C++14)

      [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 inheritingstd::binary_function<T, T, T>.

      (until C++11)

      [edit]Member functions

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

      std::plus::operator()

      T operator()(const T& lhs,const T& rhs)const;
      (constexpr since C++14)

      Returns the sum oflhs andrhs.

      Parameters

      lhs, rhs - values to sum

      Return value

      The result oflhs+ rhs.

      [edit]Exceptions

      May throw implementation-defined exceptions.

      Possible implementation

      constexpr T operator()(const T& lhs,const T& rhs)const{return lhs+ rhs;}
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/utility/functional/plus&oldid=173618"

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