Const and constexpr: Defining Immutability

Snippet

Const and constexpr: Defining Immutability

const defines a value that cannot be changed after initialization, useful for configuration values. constexpr defines values that are computed at compile time, enabling faster execution. Both prevent accidental modification of important values.

snippet.cpp
cpp
#include <iostream>
using namespace std;
 
const int MAX_SCORE = 100;
constexpr int DOUBLE(int x) { return x * 2; }
 
int main() {
    int playerScore = 75;
    
    if (playerScore > MAX_SCORE) {
        cout << "Invalid score" << endl;
    }
    
    cout << "Double: " << DOUBLE(5) << endl;
    
    return 0;
}

Breakdown

const int MAX_SCORE = 100;

A constant that cannot be modified after creation

constexpr int DOUBLE(int x) { return x * 2; }

A compile-time constant function

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Const and constexpr: Defining Immutability

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