Constructs a pool with an automatically determined number of threads.

thread_pool();
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template<
    typename Allocator>
thread_pool(
    allocator_arg_t ,
    const Allocator & a);
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Constructs a pool with a specified number of threads.

explicit thread_pool(
    std::size_t num_threads);
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template<
    typename Allocator>
thread_pool(
    allocator_arg_t ,
    const Allocator & a,
    std::size_t num_threads);
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thread_pool(
    std::size_t num_threads,
    const execution_context::service_maker & initial_services);
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template<
    typename Allocator>
thread_pool(
    allocator_arg_t ,
    const Allocator & a,
    std::size_t num_threads,
    const execution_context::service_maker & initial_services);
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