#### io_context::io_context

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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