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The All-in-One Guide to C++20

Solution: Detect Narrowing Conversion

Explore how designated initializers work in C++ and how they help detect narrowing conversions during class member initialization. Understand the compile-time errors caused by narrowing conversions and the differences between C and C++ designated initialization behaviors. This lesson helps you write safer, more reliable initialization code by catching type-related issues early.

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Solution

C++
#include <iostream>
struct Point2D { 
    int x;
    int y; 
};
class Point3D {
    public:
        int x;
        int y = 1;
        int z = 2;
};
int main() {
    std::cout << '\n';
    Point2D point2D{.x = 1, .y = 2.5};
    Point3D point3D{.x = 1, .y = 2, .z = 3.5f};
    std::cout << "point2D: " << point2D.x << " " << point2D.y << " ";
    std::cout << "point3D: " << point3D.x << " " << point3D.y << " "
                             << point3D.z << '\n';
    std::cout << '\n';
}

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