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List:       boost
Subject:    [boost] [config] BOOST_NOEXCEPT on MSVC
From:       Michael Marcin <mike.marcin () gmail ! com>
Date:       2013-03-31 5:11:39
Message-ID: kj8gpj$l3u$1 () ger ! gmane ! org
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Why isn't BOOST_NOEXCEPT defined to be throw() for msvc?

Microsoft Visual Studio 11.0\VC\include\yvals.h

defines:
#define _NOEXCEPT	throw ()

and the rest of the standard library implementation uses it

ex.
void swap(thread& _Other) _NOEXCEPT
		{	// swap with _Other
		_STD swap(_Thr, _Other._Thr);
		}

http://msdn.microsoft.com/en-us/library/wfa0edys.aspx states:

throw()
The function does not throw an exception. However, if an exception is 
thrown out of a function marked throw(), the Visual C++ compiler will 
not call unexpected (see unexpected (CRT) and unexpected (<exception>) 
for more information). If a function is marked with throw(), the Visual 
C++ compiler will assume that the function does not throw C++ exceptions 
and generate code accordingly. Due to code optimizations that might be 
performed by the C++ compiler (based on the assumption that the function 
does not throw any C++ exceptions) if a function does throw an 
exception, the program may not execute correctly.

It seems a better choice here than expanding BOOST_NOEXCEPT to nothing.


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