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Don't define static_assert for C++.

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Even though _Static_assert() is pretty robust for C code, it cannot work
correctly with C++ code.  This is due to the fact that C++ template
parameters may contain commas that are not enclosed in parentheses. For
example:

	static_assert(foo<int, int>::bar == baz, "...");

This causes _Static_assert to be called with an excessive number of
parameters.  If you want to use static_assert in C++, just use a C++11
compiler.

Reported on:	current@, ports@
This commit is contained in:
Ed Schouten 2011-12-29 14:41:17 +00:00
parent 47e236b178
commit ffa01562fd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228955
1 changed files with 10 additions and 1 deletions
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11
include/assert.h
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@ -58,7 +58,16 @@
#ifndef _ASSERT_H_
#define _ASSERT_H_
#if __ISO_C_VISIBLE >= 2011 && (!defined(__cplusplus) || __cplusplus < 201103L)
/*
* Static assertions. In principle we could define static_assert for
* C++ older than C++11, but this breaks if _Static_assert is
* implemented as a macro.
*
* C++ template parameters may contain commas, even if not enclosed in
* parentheses, causing the _Static_assert macro to be invoked with more
* than two parameters.
*/
#if __ISO_C_VISIBLE >= 2011 && !defined(__cplusplus)
#define static_assert _Static_assert
#endif