boost::beast::has_get_io_service< T, class > Struct Template Reference

#include <type_traits.hpp>

Inheritance diagram for boost::beast::has_get_io_service< T, class >:

Detailed Description

template<class T, class = void>
struct boost::beast::has_get_io_service< T, class >

Determine if T has the get_io_service member.

Metafunctions are used to perform compile time checking of template types. This type will be std::true_type if T has the member function with the correct signature, else type will be std::false_type.

Example

Use with tag dispatching:

template<class T>
void maybe_hello(T& t, std::true_type)
{
    t.get_io_service().post([]{ std::cout << "Hello, world!" << std::endl; });
}

template<class T>
void maybe_hello(T&, std::false_type)
{
    // T does not have get_io_service
}

template<class T>
void maybe_hello(T& t)
{
    maybe_hello(t, has_get_io_service<T>{});
}

Use with static_assert:

struct stream
{
    boost::asio::io_service& get_io_service();
};

static_assert(has_get_io_service<stream>::value,
    "Missing get_io_service member");

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The documentation for this struct was generated from the following file:

• 3pp/beast/boost/beast/core/type_traits.hpp