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Diffstat (limited to 'docs/LanguageExtensions.html')
| -rw-r--r-- | docs/LanguageExtensions.html | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html index 27d90c5cd3..f27a570539 100644 --- a/docs/LanguageExtensions.html +++ b/docs/LanguageExtensions.html @@ -136,6 +136,30 @@ can be used like this:</p> <p>The feature tag is described along with the language feature below.</p> <!-- ======================================================================= --> +<h3 id="__has_attribute">__has_attribute</h3> +<!-- ======================================================================= --> + +<p>This function-like macro takes a single identifier argument that is the name +of an attribute. It evaluates to 1 if the attribute is supported or 0 if not. It +can be used like this:</p> + +<blockquote> +<pre> +#ifndef __has_attribute // Optional of course. + #define __has_attribute(x) 0 // Compatibility with non-clang compilers. +#endif + +... +#if __has_attribute(override) || \ +#define OVERRIDE __attribute__((override)) +#else +#define OVERRIDE +#endif +... +</pre> +</blockquote> + +<!-- ======================================================================= --> <h2 id="has_include">Include File Checking Macros</h2> <!-- ======================================================================= --> |