A method const with std::future-CodePudding

I have a class A that has vectors:

std::vector < std::shared_ptr<B> > bvec;
std::vector<std::future<void> > futures;

Where B is another class.

I have a method:

void A::Method() const {
    for (auto&& b : bvec) {
        futures.push_back(std::async(std::launch::async, fun));
    }
}

Where:

void fun(std::shared_ptr<B> b) {
    b->bMethod();
}

Since there is that "const" after "A::Method()", I cannot modify future inside that method. Creating a vector locally/globally doesn't help. Is there another way to optimize the for loop inside of the A::Method() without removing "const"?

CodePudding user response：

Remove the const. There is no reason why that function should be const. Lying in your interface is never a good idea.

CodePudding user response：

try setting the future mutable:

mutable std::vector<std::future<void> > futures;

shoud do the trick (that said, may not be a good idea on a design stand point, but ths is hard to tell as we know little of your design...)