#### posix::basic_descriptor::basic_descriptor

Construct a descriptor without opening it.

    explicit basic_descriptor(
        const executor_type & ex);
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    template<
        typename ExecutionContext>
    explicit basic_descriptor(
        ExecutionContext & context,
        typename constraint< is_convertible< ExecutionContext &, execution_context & >::value, defaulted_constraint >::type  = defaulted_constraint());
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Construct a descriptor on an existing native descriptor.

    basic_descriptor(
        const executor_type & ex,
        const native_handle_type & native_descriptor);
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    template<
        typename ExecutionContext>
    basic_descriptor(
        ExecutionContext & context,
        const native_handle_type & native_descriptor,
        typename constraint< is_convertible< ExecutionContext &, execution_context & >::value >::type  = 0);
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Move-construct a descriptor from another.

    basic_descriptor(
        basic_descriptor && other);
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