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C++ Fundamentals for Professionals

- Examples

Explore how to implement constexpr functions and use auto type deduction for compile-time efficiency and safety in C++. Understand assertions, constexpr variables, and compile-time array initialization to write adaptable and safe C++ code.

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Assertions #

C++
#include <iostream>
constexpr int square(int x) { return x * x; }
constexpr int squareToSquare(int x){ return square(square(x));}
int main() {
  std::cout << std::endl;
  static_assert(square(10) == 100, "you calculated it wrong");
  static_assert(squareToSquare(10) == 10000 , "you calculated it wrong");
  std::cout<< "square(10) = " << square(10) << std::endl;
  std::cout<< "squareToSquare(10) = " << squareToSquare(10) << std::endl;
  constexpr int constExpr = square(10);
  int arrayClassic[100];
  int arrayNewWithConstExpression[constExpr];
  int arrayNewWithConstExpressioFunction[square(10)];
  std::cout << std::endl;
}

Explanation

  • In the example above, we have implemented two constexpr functions for C++11: constexpr int square(int x) and constexpr int squareToSquare(int x). As we can see, both follow ...