#error and BOOST_STATIC_ASSERT

[Alex Vinokur]

Hi,

#error enables the user to print user-supplied text but doesn't print
__FILE__ and __LINE__.
BOOST_STATIC_ASSERT prints __FILE__ and __LINE__ but doesn't enable to
to print user-supplied text .

Is there any method to print both __FILE__/__LINE__ and user-supplied
text in compile-time?


Alex Vinokur
email: alex DOT vinokur AT gmail DOT com
http://mathforum.org/library/view/10978.html
http://sourceforge.net/users/alexvn

 

[Barry]

Hi,

#error enables the user to print user-supplied text but doesn't print
__FILE__ and __LINE__.

diagnostic message produced by "#error " depends on implementation

BOOST_STATIC_ASSERT prints __FILE__ and __LINE__ but doesn't enable to
to print user-supplied text .

BOOST_STATIC_ASSERT produces compile error message (which often includes
line information).

refer to:
http://www.boost.org/doc/libs/1_35_0/doc/html/boost_staticassert/how.html

in C++0x, static_assert would be implemented as language core,
see Comeau Online tryout, or the current GCC

Is there any method to print both __FILE__/__LINE__ and user-supplied
text in compile-time?

IIRC, Loki's implementation uses macro joining to produce a new name for
error message.

in C++0x, static_assert /would/ be implemented as language core,
see Comeau Online tryout, or the current GCC.

 

[Fokko Beekhof]

There is a nice trick that works for assert, maybe it'll work for
static_asserts too:

assert( (x < 3) && "x must be smaller than 3!" );