X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/90856fe0b82ba19d1c3d73a4ba48007380201e66..ac1a0ce1c6ba60a3faddc64463cb7a697b9d8fd2:/lib/verify.h

diff --git a/lib/verify.h b/lib/verify.h
index c6d30a35af..cef14ad157 100644
--- a/lib/verify.h
+++ b/lib/verify.h
@@ -1,6 +1,6 @@
 /* Compile-time assert-like macros.
 
-   Copyright (C) 2005-2006, 2009-2011 Free Software Foundation, Inc.
+   Copyright (C) 2005-2006, 2009-2012 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -21,13 +21,11 @@
 # define _GL_VERIFY_H
 
 
-/* Define _GL_HAVE__STATIC_ASSERT to 1 if _Static_assert works as per the
-   C1X draft N1548 section 6.7.10.  This is supported by GCC 4.6.0 and
-   later, in C mode, and its use here generates easier-to-read diagnostics
-   when verify (R) fails.
+/* Define _GL_HAVE__STATIC_ASSERT to 1 if _Static_assert works as per C11.
+   This is supported by GCC 4.6.0 and later, in C mode, and its use
+   here generates easier-to-read diagnostics when verify (R) fails.
 
-   Define _GL_HAVE_STATIC_ASSERT to 1 if static_assert works as per the
-   C++0X draft N3242 section 7.(4).
+   Define _GL_HAVE_STATIC_ASSERT to 1 if static_assert works as per C++11.
    This will likely be supported by future GCC versions, in C++ mode.
 
    Use this only with GCC.  If we were willing to slow 'configure'
@@ -188,7 +186,7 @@ template <int w>
    trailing ';'.  If R is false, fail at compile-time, preferably
    with a diagnostic that includes the string-literal DIAGNOSTIC.
 
-   Unfortunately, unlike C1X, this implementation must appear as an
+   Unfortunately, unlike C11, this implementation must appear as an
    ordinary declaration, and cannot appear inside struct { ... }.  */
 
 # ifdef _GL_HAVE__STATIC_ASSERT
@@ -205,7 +203,7 @@ template <int w>
 #   define _Static_assert(R, DIAGNOSTIC) _GL_VERIFY (R, DIAGNOSTIC)
 #  endif
 #  if !defined _GL_HAVE_STATIC_ASSERT && !defined static_assert
-#   define static_assert _Static_assert /* Draft C1X requires this #define.  */
+#   define static_assert _Static_assert /* C11 requires this #define.  */
 #  endif
 # endif
 
@@ -221,10 +219,18 @@ template <int w>
    contexts, e.g., the top level.  */
 
 /* Verify requirement R at compile-time, as an integer constant expression.
-   Return 1.  */
+   Return 1.  This is equivalent to verify_expr (R, 1).
+
+   verify_true is obsolescent; please use verify_expr instead.  */
 
 # define verify_true(R) _GL_VERIFY_TRUE (R, "verify_true (" #R ")")
 
+/* Verify requirement R at compile-time.  Return the value of the
+   expression E.  */
+
+# define verify_expr(R, E) \
+    (_GL_VERIFY_TRUE (R, "verify_expr (" #R ", " #E ")") ? (E) : (E))
+
 /* Verify requirement R at compile-time, as a declaration without a
    trailing ';'.  */