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CppTemplateFunction

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(C++) Template function

A template function is a "function parameterized by types, values, or templates. The function to be generated from a template function can usually be deduced from the function arguments in a call" [1].

//Sum two values of equal data type
template <class T>
T sum(const T& value1, const T& value2)
{  
  return value1 + value2;
}
template <class T>
T swap(T& value1, T& value2)
{  
  const T temp = value1;
  value1 = value2;
  value2 = temp;
}
//Sum a vector of any type
template <class T>
T sum(const std::vector<T>& v)
{  
  const int size = v.size(); //A vector's size is always of type int
  T mySum = 0.0;
  for(int i=0; i<size; ++i); //An index counter is always of type int
  {
    mySum+=v[i];
  }
  return mySum;
}

Note that all these functions are in the STL (the latter is called accumulate) and are all templated.

Code links

• class
• const
• for
• return
• struct
• template

Reference

• Bjarne Stroustrup's C++ glossary. http://www.research.att.com/~bs/glossary.html

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