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

This is an older version of Boost and was released in 2013. The current version is 1.89.0.

has_service

has_service

template<
    typename Service>
bool has_service(
    io_service & ios);

This function is used to determine whether the io_service contains a service object corresponding to the given service type.

Parameters

ios: The io_service object that owns the service.

Return Value

A boolean indicating whether the io_service contains the service.