就是你的main函数声明了好几个!
../my_header.h:43:1: error: multiple types in one declaration 43 | }; | ^ …在我的例子中,第 43 行位于 class MyClass 定义的末尾。 解决方案:在 enum 定义的末尾添加缺少的分号 ( ; ), 如@eguaio here 和@MSalters here 所述。 原文由 Gabriel Staples 发布,翻译遵循 CC BY-SA 4.0 许可...
当不同文件内定义同名(即便类型和含义不同)的全局变量时,该变量共享同一块内存(地址相同)。若变量定义时均初始化,则会产生重定义(multiple definition)的链接错误;若某处变量定义时未初始化,则无链接错误,仅在因类型不同而大小不同时可能产生符号大小变化(size of symbol `XXX' changed)的编译警告。 在最坏情况...
Cannot open multiple items from this location. Try selecting a single item instead cannot open source file "stdafx.h" cant find declaration of structure in .h file capturing and injecting click events into a win32 GUI with an external program Cast unsigned char (uint8 *) pointer to unsigned...
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2.1 用于声明变量 (For Variable Declaration) 在C++中,extern关键字主要用于声明一个变量或函数。当我们使用extern关键字声明一个变量时,我们告诉编译器这个变量在其他地方定义了,这里只是引用它。这样,我们可以在多个文件中共享同一个变量。 例如,我们可以在一个文件(比如main.cpp)中定义一个全局变量int g_var = ...
Multiple__attributes__can be strung together on a single declaration, and this is not uncommon in practice. You can either use two separate__attribute__s, or use one with a comma-separated list: /*send printf-like message to stderr and exit*/ ...
「【注4】声明(declaration)与定义(definition)」 全局变量或函数可(在多个编译单元中)有多处声明,但只允许定义一次。全局变量定义时分配空间并赋初始值(如果有);函数定义时提供函数体内容。 代码语言:javascript 复制 声明: extern int iGlobal;extern intfunc();或intfunc();定义: ...
非常实用的,吸收前辈的经验,我们才能少走弯路。和C 编译器错误信息中文翻译1L15 重复调用WARNING L15: MULTIPLE CALL TO SEGMENTSEGMENT: PRSPIRECEIVEWORDDSPICALLER1: