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c++debuggingboostmetaprogrammingstatic-assert
lurscher
lurscher

Reputation: 26983

boost static_assert with message?

on 1.43 boost it seems that BOOST_STATIC_ASSERT just allows to put a boolean value, is there some alternative that allows me to display a message as well on the compile error?

Upvotes: 3

Views: 4367

Answers (3)

VLL
VLL

Reputation: 10165

Boost 1.47 and later support BOOST_STATIC_ASSERT_MSG. Usage:

#include <boost/static_assert.hpp>
BOOST_STATIC_ASSERT_MSG(condition, msg)

If C++11 is available, or the compiler supports static_assert(), the error message will be msg string. Else the macro is treated as BOOST_STATIC_ASSERT(condition)

Upvotes: 0

Georg Fritzsche
Georg Fritzsche

Reputation: 99054

MPL has BOOST_MPL_ASSERT_MSG. E.g. using GCC 4.2. with this:

BOOST_MPL_ASSERT_MSG(false, THIS_DOESNT_WORK, (void));

... results in:

/path/to/file.cpp:42: error: no matching function for call to 
'assertion_failed(mpl_::failed************ (function()::THIS_DOESNT_WORK::************)())'

Upvotes: 5

reece
reece

Reputation: 8155

Have you tried something like:

BOOST_STATIC_ASSERT(sizeof(long) == 64 && "Must have 64-bit long!")

If your compiler supports the C++0x static_assert, you can do:

static_assert(sizeof(long) == 64, "Must have 64-bit long!")

Upvotes: 3

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