A plus() function template. - C++ template

C++ examples for template:template function

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Description

A plus() function template.

Demo Code

#include <iostream>
#include <string>
using std::string;

template <typename T>
T plus(const T a, const T b){
  return a + b;//w ww  .  j a va2s.c  o m
}

template <>
const char* plus(const char* a, const char* b){
  return (string {a} + b).c_str();
}

//oveload the template to allow plus() to be called for C-style strings
const char* plus(const char* a, const char* b)
{
  return (string {a} +b).c_str();
}

int main(){
  int n {plus(3, 4)};
  std::cout << "plus(3, 4) returns " << n << std::endl;
  double d {plus(3.2, 4.2)};

  std::cout << "plus(3.2, 4.2) returns " << d << std::endl;
  string s {plus("he", "llo")};
  std::cout << "plus(\"he\", \"llo\") returns " << s << std::endl;

  string s1 {"aaa"};
  string s2 {"bbb"};
  string s3 {plus(s1, s2)};
  std::cout << "With s1 as " << s1 << " and s2 as " << s2 << std::endl;

  std::cout << "plus(s1, s2) returns " << s3 << std::endl;
}

Result


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