Can std::async be use with template functions

Question

Is std::async supose to work with template function? I\'ve tried to lauch std::reverse as an asynchronous task bu got compile-time error.

I\'ve tried to use simpler

Answer 1

std::reverse is not a function but a function template, you can use an specialization of that template (which is a function):

auto result_reverse = std::async(&std::reverse<std::string::iterator>, str.begin(), str.end());

Answer 2

It can, but the invocation is a bit different:

auto result_reverse = std::async([&str]() {
        std::reverse(str.begin(), str.end());
    });

This is because std::reverse() is not a function, rather a function template that turns into a function when it is invoked as a function.

The above reverses a copy of the string and throws away the result. To pass the string by reference the lambda expression should be changed to start with [&str]().