2 Copyright 2007 John Maddock.
3 Copyright 2013 Antony Polukhin.
4 Distributed under the Boost Software License, Version 1.0.
5 (See accompanying file LICENSE_1_0.txt or copy at
6 http://www.boost.org/LICENSE_1_0.txt).
9 [section:has_trivial_move_constructor has_trivial_move_constructor]
12 struct has_trivial_move_constructor : public __tof {};
14 __inherit If T is a (possibly cv-qualified) type with a trivial move-constructor
15 then inherits from __true_type, otherwise inherits from __false_type.
17 If a type has a trivial move-constructor then the constructor has the same effect
18 as copying the bits of one object to the other:
19 calls to the constructor can be safely replaced with a call to `memcpy`.
21 __compat Without some (as yet unspecified) help from the compiler,
22 has_trivial_move_constructor will never report that a user-defined class or struct has a
23 trivial constructor; this is always safe, if possibly sub-optimal.
24 In addition C++11's `decltype` is required to correctly support deleted or private
26 Currently (June 2015) compilers that have the necessary __intrinsics to ensure that this
27 trait "just works" include Clang, GCC-5.1, and MSVC-12.0.
28 You may also test to see if the necessary __intrinsics are available
29 by checking to see if the macro `BOOST_HAS_TRIVIAL_MOVE_CONSTRUCTOR` is defined.
32 __header ` #include <boost/type_traits/has_trivial_move_constructor.hpp>` or ` #include <boost/type_traits.hpp>`
36 [:`has_trivial_move_constructor<int>` inherits from `__true_type`.]
38 [:`has_trivial_move_constructor<char*>::type` is the type `__true_type`.]
40 [:`has_trivial_move_constructor<int (*)(long)>::value` is an integral constant
41 expression that evaluates to /true/.]
43 [:`has_trivial_move_constructor<MyClass>::value` is an integral constant
44 expression that evaluates to /false/.]
46 [:`has_trivial_move_constructor<T>::value_type` is the type `bool`.]