has_nothrow_assign.qbk 1.1 KB

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  1. [/
  2. Copyright 2007 John Maddock.
  3. Distributed under the Boost Software License, Version 1.0.
  4. (See accompanying file LICENSE_1_0.txt or copy at
  5. http://www.boost.org/LICENSE_1_0.txt).
  6. ]
  7. [section:has_nothrow_assign has_nothrow_assign]
  8. template <class T>
  9. struct has_nothrow_assign : public __tof {};
  10. __inherit If T is a (possibly cv-qualified) type with a non-throwing assignment-operator
  11. then inherits from __true_type, otherwise inherits from __false_type. Type `T`
  12. must be a complete type.
  13. __compat Either requires C++11 `noexcept` and `decltype` or else some (unspecified) help from the compiler.
  14. Currently (June 2015) compilers more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0,
  15. Intel-11.0, and Codegear and all recent GCC versions have the necessary compiler __intrinsics to ensure that this
  16. trait "just works". You may test to see if the necessary support is available
  17. by checking to see if `defined(BOOST_HAS_NOTHROW_CONSTRUCTOR) || (!defined(BOOST_NO_CXX11_DECLTYPE) && !defined(BOOST_NO_CXX11_NOEXCEPT))` is true.
  18. __header ` #include <boost/type_traits/has_nothrow_assign.hpp>` or ` #include <boost/type_traits.hpp>`
  19. [endsect]