How to call a non-const function within a const function (C++)
int Random() const { return var_ ? const_cast<ClassType*>(this)->newCall(4) : 0; } But it’s not a good idea. Avoid if it’s possible!
const-cast
Idiomatic way to create an immutable and efficient class in C++
You truly want immutable objects of some type plus value semantics (as you care about runtime performance and want to avoid the heap). Just define a struct with all data members public. struct Immutable { const std::string str; const int i; }; You can instantiate and copy them, read data members, but that’s about it. … Read more
Correct usage(s) of const_cast
it is pretty much designed to be only used with legacy APIs that are not const correct i.e. with a function you can’t change that has non const interface but doesn’t actually mutate anything on the interface
How to use const_cast?
You are not allowed to const_cast and then modify variables that are actually const. This results in undefined behavior. const_cast is used to remove the const-ness from references and pointers that ultimately refer to something that is not const. So, this is allowed: int i = 0; const int& ref = i; const int* ptr … Read more
Is const_cast safe?
const_cast is safe only if you’re casting a variable that was originally non-const. For example, if you have a function that takes a parameter of a const char *, and you pass in a modifiable char *, it’s safe to const_cast that parameter back to a char * and modify it. However, if the original … Read more