is_nothrow_move_assignable.qbk 1.4 KB

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  1. [/
  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).
  7. ]
  8. [section:is_nothrow_move_assignable is_nothrow_move_assignable]
  9. template <class T>
  10. struct is_nothrow_move_assignable : public __tof {};
  11. __inherit If `T` is a (possibly cv-qualified) type with a non-throwing move assignment-operator
  12. or a type without move assignment-operator but with non-throwing assignment-operator,
  13. then inherits from __true_type, otherwise inherits from __false_type. Type `T`
  14. must be a complete type.
  15. In other words, inherits from __true_type only if expression `variable1 = std::move(variable2)`
  16. won't throw (`variable1` and `variable2` are variables of type `T`).
  17. __compat If the compiler does not support partial-specialization of class
  18. templates, then this template can not be used with function types.
  19. Without some (C++11 noexcept shall work correctly) help from the compiler,
  20. `is_nothrow_move_assignable` will never report that a class or struct has a
  21. non-throwing assignment-operator; this is always safe, if possibly sub-optimal.
  22. Currently (June 2015) MSVC-12.0, Clang and GCC 4.7 have the necessary compiler support to ensure that this
  23. trait "just works".
  24. __header ` #include <boost/type_traits/is_nothrow_move_assignable.hpp>` or ` #include <boost/type_traits.hpp>`
  25. [endsect]