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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