Submits a completion token or function object for execution.

template<
    typename NullaryToken>
auto defer(
    NullaryToken && token);
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template<
    typename Executor,
    typename NullaryToken = default_completion_token_t<Executor>>
auto defer(
    const Executor & ex,
    NullaryToken && token = default_completion_token_t< Executor >(),
    constraint_t<(execution::is_executor< Executor >::value &&can_require< Executor, execution::blocking_t::never_t >::value)||is_executor< Executor >::value >  = 0);
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template<
    typename ExecutionContext,
    typename NullaryToken = default_completion_token_t<typename ExecutionContext::executor_type>>
auto defer(
    ExecutionContext & ctx,
    NullaryToken && token = default_completion_token_t< typename ExecutionContext::executor_type >(),
    constraint_t< is_convertible< ExecutionContext &, execution_context & >::value >  = 0);
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Requirements

Header: boost/asio/defer.hpp

Convenience header: boost/asio.hpp