boost/libs/type_traits/doc/has_nothrow_constructor.qbk

[/ 
  Copyright 2007 John Maddock.
  Distributed under the Boost Software License, Version 1.0.
  (See accompanying file LICENSE_1_0.txt or copy at
  http://www.boost.org/LICENSE_1_0.txt).
]

[section:has_nothrow_constructor has_nothrow_constructor]

   template <class T>
   struct has_nothrow_constructor : public __tof {};
  
   template <class T>
   struct has_nothrow_default_constructor : public __tof {};
  
__inherit If T is a (possibly cv-qualified) type with a non-throwing default-constructor
then inherits from __true_type, otherwise inherits from __false_type.  Type `T`
must be a complete type.

These two traits are synonyms for each other.

__compat If the compiler does not support partial-specialization of class 
templates, then this template can not be used with function types.

Without some (unspecified) help from the compiler, 
`has_nothrow_constructor` will never report that a class or struct has a 
non-throwing default-constructor; this is always safe, if possibly sub-optimal.
Currently (May 2011) compilers more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0, 
Intel-11.0, and Codegear have the necessary compiler __intrinsics to ensure that this 
trait "just works".  You may also test to see if the necessary __intrinsics are available 
by checking to see if the macro `BOOST_HAS_NOTHROW_CONSTRUCTOR` is defined.

__header ` #include <boost/type_traits/has_nothrow_constructor.hpp>` or ` #include <boost/type_traits.hpp>`

[endsect]