On 15/07/16 22:50, Walter Bright wrote:
You can do logical const in D just like in C++, and get those performance gains. You just can't call it "const". But you can call it /*logical_const*/ and get the same result.
No, you can't. The fact that the compiler enforces the no const to mutable transition (unless you use a cast) is one of the main appeals of using const in any language. If you call something "logical const", but the compiler does not help you to catch bugs, then I don't see the point.
In effect, if logical const is what you want, C++ gives you a tool while D leaves you to your own devices. As a result, a lot of places you'd define as const in C++ are defined mutable in D, losing language expressiveness.
Shachar
