trait
Rust-like traits implementation in C++
Implementation that uses macros demo.cpp https://godbolt.org
cpp2(
trait Shape as (
fn area as (() const -> f32),
fn name as (() const -> std::string)
)
);
struct Circle {
f32 radius = {};
auto area() const -> f32 { return f32(M_PI) * radius * radius; }
auto name() const -> std::string { return "Circle"; }
};
stl::impl<Shape> auto circle = Circle{.radius = 10};
stl::dyn<Shape&> shape = &circle;Implementation that uses deducing this and macros demo_deducing_this.cpp
cpp2(
trait Shape as (
fn area as (() const -> f32),
fn name as (() const -> std::string)
)
type Circle as (
f32 radius = {};
auto area(__this &self) -> f32 {
return return f32(M_PI) * self.radius * self.radius;
}
auto name(__this &self) -> std::string {
return "Circle";
}
)
);
stl::impl<Shape> auto circle = Circle{.radius = 10};
stl::dyn<Shape&> shape = &circle;Implementation that uses p1240r1 demo_p1240r1.cpp https://godbolt.org
struct Shape {
auto area() const -> f32;
auto name() const -> std::string;
};
struct Circle {
f32 radius = {};
auto area() const -> f32 { return f32(M_PI) * radius * radius; }
auto name() const -> std::string { return "Circle"; }
};
auto circle = Circle{.radius = 10};
stl::dyn<Shape> shape = circle;