C++ 预期的 ; 在顶级声明符之后，xcode 中出现错误
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Expected ; after top level declarator, error in xcode
提问by cube
I am working with this utils.cfile in xcode, which has the following:
我正在xcode 中使用这个utils.c文件，它具有以下内容：
#if FF_API_AVCODEC_OPEN
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
return avcodec_open2(avctx, codec, NULL);
}
It's causing an Expected ; after top level declarator, error (during build) in xcode at this line: int attribute_align_arg avcodec_open(....
它Expected ; after top level declarator在 xcode 中的这一行导致, 错误（在构建期间）：int attribute_align_arg avcodec_open(....
Why? and what should I do to resolve this.
为什么？我该怎么做才能解决这个问题。
Thank you.
谢谢你。
回答by Zord
I ran into this error when using the auto completion.
我在使用自动完成时遇到了这个错误。
When inserting the parameter of a function, XCode will insert placeholders that need to be edited but show as completely valid C++ in the GUI.
当插入函数的参数时，XCode 将插入需要编辑但在 GUI 中显示为完全有效的 C++ 的占位符。
It took me some hours until I checked my file in another editor, revealing that instead of the expected:
我花了几个小时，直到我在另一个编辑器中检查我的文件，发现而不是预期的：
void func(int a)
void func(int a)
XCode had actually inserted
XCode实际上已经插入
void func(<#int a#>)
void func(<#int a#>)
In the XCode editor the parameter shows as int awith a light blue background, so it isn't easy to spot as the source of the compiler error.
在 XCode 编辑器中，参数显示为int a浅蓝色背景，因此不容易识别为编译器错误的来源。
回答by owenfi
I ran into this after moving a class to a dynamic library but leaving the old import around. Commenting out the old import resolved the issue (but it wasn't the first thing I looked for as the dynamic library import was earlier and also showed an error).
在将类移动到动态库但保留旧的导入后，我遇到了这个问题。注释掉旧的导入解决了这个问题（但这不是我寻找的第一件事，因为动态库导入更早并且还显示了错误）。
回答by Prateek Sharma
I got a similar error in xcode for the following code:
对于以下代码，我在 xcode 中遇到了类似的错误：
#ifndef Parser_hpp
#define Parser_hpp
#include <string>
std::string getTitle();
#endif /* Parser_hpp */
The reason was that the code had to be wrapped with C++ preprocessor directives. Like so:
原因是代码必须用 C++ 预处理器指令包装。像这样：
#ifndef Parser_hpp
#define Parser_hpp
#if defined __cplusplus
#include <string>
std::string getTitle();
#endif /* __cplusplus */
#endif /* Parser_hpp */
