#### executor::executor

Default constructor.

    executor();
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Construct from nullptr.

    executor(
        nullptr_t );
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Copy constructor.

    executor(
        const executor & other);
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Move constructor.

    executor(
        executor && other);
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Construct a polymorphic wrapper for the specified executor.

    template<
        typename Executor>
    executor(
        Executor e);
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Allocator-aware constructor to create a polymorphic wrapper for the specified executor.

    template<
        typename Executor,
        typename Allocator>
    executor(
        allocator_arg_t ,
        const Allocator & a,
        Executor e);
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