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Diffstat (limited to 'docs/LanguageExtensions.html')
| -rw-r--r-- | docs/LanguageExtensions.html | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html index dfffd2f5d6..67e60dec4d 100644 --- a/docs/LanguageExtensions.html +++ b/docs/LanguageExtensions.html @@ -112,6 +112,24 @@ int g(int) { } <i>// error: redeclaration of "g" must also have the "overloadabl </pre> </blockquote> +<p>Functions marked <tt>overloadable</tt> must have +prototypes. Therefore, the following code is ill-formed:</p> + +<blockquote> +<pre> +int h() __attribute__((overloadable)); <i>// error: h does not have a prototype</i> +</pre> +</blockquote> + +<p>However, <tt>overloadable</tt> functions are allowed to use a +ellipsis even if there are no named parameters (as is permitted in C++). This feature is particularly useful when combined with the <tt>unavailable</tt> attribute:</p> + +<blockquote> +<pre> +void honeypot(..) __attribute__((overloadable, unavailable)); <i>// calling me is an error</i> +</pre> +</blockquote> + <p>Functions declared with the <tt>overloadable</tt> attribute have their names mangled according to the same rules as C++ function names. For example, the three <tt>tgsin</tt> functions in our |