- Examples

// templateArgumentDeduction.cpp
#include <iostream>
template <typename T>
bool isSmaller(T fir, T sec){
  return fir < sec;
}
template <typename T, typename U>
bool isSmaller2(T fir, U sec){
  return fir < sec;
}
template <typename R, typename T, typename U>
R add(T fir, U sec){
  return fir + sec;
}
int main(){
  std::cout << std::boolalpha << std::endl;
  std::cout << "isSmaller(1,2): " << isSmaller(1,2) << std::endl;
  // std::cout << "isSmaller(1,5LL): "  << isSmaller(1,5LL) << std::endl; // ERROR
  std::cout << "isSmaller<int>(1,5LL): " << isSmaller<int>(1,5LL) << std::endl;
  std::cout << "isSmaller<double>(1,5LL): " << isSmaller<double>(1,5LL) << std::endl;
  std::cout << std::endl;
  std::cout << "isSmaller2(1,5LL): "  << isSmaller2(1,5LL) << std::endl;
  std::cout << std::endl;
  std::cout << "add<long long int>(1000000,1000000): " << add<long long int>(1000000, 1000000) << std::endl;
  std::cout << "add<double,double>(1000000,1000000): " << add<double,double>(1000000, 1000000) << std::endl;
  std::cout << "add<double,double,float>(1000000,1000000): " << add<double,double,float>(1000000, 1000000) << std::endl;
  std::cout << std::endl;
}