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

Query the current value of the allocator property.

template<
    typename OtherAllocator>
constexpr Allocator query(
    execution::allocator_t< OtherAllocator > ) const;

Do not call this function directly. It is intended for use with the query customisation point.

For example:

boost::asio::system_executor ex;
auto alloc = boost::asio::query(ex,
    boost::asio::execution::allocator);