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Implementing Rust-like traits for C++ 20 (with no runtime overhead)
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3 points
by jmax01
556 days ago
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Example Code: struct Shape { void draw();
int area(int x, int y);
};make_trait(Shape, draw, area); int main() { auto circle = Circle();
auto square = Square();
// NOTE: all of this is strictly checked, so if you are creating
// a trait out of a Object, the object MUST implement all the trait functions
auto t0 = trait<Shape>::make(&circle);
t0.draw();
auto t1 = trait<Shape>::make(&square);
t1.draw();
// Another thing to be kept in mind is trait<T> is just like a View
// It DOES NOT OWN anything, so you are the one making sure the data
// pointer is valid
auto array = std::array{t1, t0};
for (auto& shape : array) {
std::cout << shape.area(2, 3) << std::endl;
}
}Repository: github.com/Jaysmito101/rusty.hpp?tab=readme-ov-file#traits-in-c |
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