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Added tip for MSVC preprocessor defines

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[SVN r39656]
This commit is contained in:
Paul A. Bristow
2007-10-02 17:38:24 +00:00
parent cabc722e56
commit aec354d968
1 changed files with 24 additions and 2 deletions
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26
doc/policy_tutorial.qbk
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@@ -112,10 +112,32 @@ The following sections introduce these methods in more detail.
The default policies used by the library are changed by the usual
configuration macro method.
For example passing `-DBOOST_MATH_DOMAIN_ERROR_POLICY=errno_on_error` to
For example, passing `-DBOOST_MATH_DOMAIN_ERROR_POLICY=errno_on_error` to
your compiler will cause domain errors to set `::errno` and return a NaN
rather than the usual default behaviour of throwing a `std::domain_error`
exception. There is however a very important caveat to this:
exception.
[tip For Microsoft Visual Studio,you can add to the Project Property Page,
C/C++, Preprocessor, Preprocessor definitions like:] [/MSVC tip]
[pre
\"BOOST_MATH_ASSERT_UNDEFINED_POLICY\=0\"
\"BOOST_MATH_OVERFLOW_ERROR_POLICY\=\"errno_on_error\"\"
]
This may be helpful to avoid complications with pre-compiled headers
that may mean that the equivalent definitions in source code:
#define BOOST_MATH_ASSERT_UNDEFINED_POLICY false
#define BOOST_MATH_OVERFLOW_ERROR_POLICY errno_on_error
may be ignored.
The compile command line shows:
[pre
/D \"BOOST_MATH_ASSERT_UNDEFINED_POLICY\=0\"
/D \"BOOST_MATH_OVERFLOW_ERROR_POLICY\=\"errno_on_error\"\"
]
There is however a very important caveat to this:
[important
[*['Default policies changed by setting configuration macros must be changed