101 extern const QMapRect QMapRectNull;. 102. 111 static inline QMapPoint QMapPointMake(double x, double y). 112 {. 113 return (QMapPoint){x, y};. 114 }.


2013年9月5日 大家一定对C语言inline 关键字不陌生,甚至经常用到static inline 的函数。可能 感到陌生的是extern inline。C11 标准在6.7.4 p7 中对此进行了 

The definition in the header file will cause most calls to the function to be inlined. The extern keyword may be applied to a global variable, function, or template declaration. It specifies that the symbol has external linkage. For background information on linkage and why the use of global variables is discouraged, see Translation units and linkage. The extern keyword has four meanings depending on the context: An inline function or inline variable (since C++17) has the following properties: The definition of an inline function or variable (since C++17) must be reachable in the translation unit where it is accessed (not necessarily before the point of access). That said, it looks like it's a behavior that they document; their documentation says "In C++, this attribute does not depend on extern in any way, but it still requires the inline keyword to enable its special behavior." and that matches their observed behavior. And they behave this way even for functions in extern "C" blocks.

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