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C++ Fundamentals for Professionals

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Explore how automatic type deduction works in C++, focusing on the use of auto and decltype. Understand implicit type casting between integers, booleans, and doubles during arithmetic operations. This lesson prepares you to apply efficient type inference in your C++ code.

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The solution to the previous exercise can be found below:

C++
#include <iostream>
#include <typeinfo>
template<typename T1, typename T2>
auto add(T1 first, T2 second) -> decltype(first + second){
    return first + second;
}
int main(){
  std::cout << std::endl;
  // -> int
  std::cout << typeid( add(1, false) ).name() << std::endl;
  std::cout << typeid( add('a', 1) ).name() << std::endl;
  std::cout << typeid( add(false, false) ).name() << std::endl;
  // -> double
  std::cout << typeid( add(true, 3.14) ).name() << std::endl;
  std::cout << typeid( add(1, 4.0) ).name() << std::endl;
  std::cout << std::endl;
}

Explanation #

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