Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

Construct a copy of a different executor wrapper type.

template<
    typename U,
    typename OtherExecutor>
executor_binder(
    const executor_binder< U, OtherExecutor > & other);

This constructor is only valid if the Executor type is constructible from type OtherExecutor, and the type T is constructible from type U.