Question

How to use constexpr to set a static value at compilation time in C++

Answer 1

// constexpr is a value that will not change (static) and is set at the compilation time

#include <iostream>
 
class Example {
    public:
        static constexpr int num = 34;
        Example() {};
};
     

int main() {
    Example obj;
     
    std::cout << obj.num << "\n";
     
    int x = obj.num + 52;
    std::cout << x;
    
    // obj.num = 100; // error: assignment of read-only variable 'Example::num'
}
   
   
   
   
/*
run:
   
34
86
   
*/

 

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