Definition
A special C++ function which operates with generic types. Template functions are useful for common code intended to be use by multiple types without retyping it.
Syntax
template <class identifier> FunctionName;
template <typename identifier> FunctionName;
Example
The source code demonstrates a template function that returns the sum of two numbers and example usage with integer and float values.
Source Code
#include <iostream>
template<class GenericNumber> GenericNumber Add(GenericNumber nA, GenericNumber nB) throw()
{
GenericNumber nRes = nA + nB;
return nRes;
}
int main()
{
int nInt1 = 10;
int nInt2 = 6;
int nIntRes = Add<int>(nInt1, nInt2);
float nFl1 = 4.06;
float nFl2 = 2.50;
float nFlRes = Add<float>(nFl1, nFl2);
std::cout << nInt1 << "+" << nInt2 << "=" << nIntRes << std::endl;
std::cout << nFl1 << "+" << nFl2 << "=" << nFlRes << std::endl;
return 0;
}
Output
[leon@localhost tempfunc]$ g++ main.cpp -Wall -o templatefunc
[leon@localhost tempfunc]$ ./templatefunc
10+6=16
4.06+2.5=6.56
Further Reading
Templates
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