Constructor.

io_context();
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template<
    typename Allocator>
io_context(
    allocator_arg_t ,
    const Allocator & a);
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explicit io_context(
    int concurrency_hint);
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template<
    typename Allocator>
io_context(
    allocator_arg_t ,
    const Allocator & a,
    int concurrency_hint);
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explicit io_context(
    const execution_context::service_maker & initial_services);
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template<
    typename Allocator>
io_context(
    allocator_arg_t ,
    const Allocator & a,
    const service_maker & initial_services);
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