C++ 声明中的明确限定
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explicit qualification in declaration
提问by Zeno
battleutils.cpp:1037: error: explicit qualification in declaration of 'int32 battleutils::AbilityBenediction(CBattleEntity*, CBattleEntity*)'
Battleutils.cpp:1037: 错误：'int32 Battleutils::AbilityBenediction(CBattleEntity*, CBattleEntity*)' 声明中的显式限定
What does this error mean exactly?
这个错误究竟是什么意思？
The first line here is 1037 (in battleutils.cpp):
这里的第一行是 1037（在 Battleutils.cpp 中）：
int32 battleutils::AbilityBenediction(CBattleEntity* PCaster, CBattleEntity* PTarget)
{
....
return blah;
}
In the header file under:
在头文件下：
namespace battleutils
{
is this:
这是：
int32 AbilityBenediction(CBattleEntity* PCaster, CBattleEntity* PTarget);
The .cpp file correctly includes the header file.
.cpp 文件正确包含头文件。
回答by Benrobot
I ran into the same issue. I had some source that compiled using MS Visual Studio but using g++ in Linux it gave me:
我遇到了同样的问题。我有一些使用 MS Visual Studio 编译的源代码，但在 Linux 中使用 g++ 它给了我：
... error: explicit qualification in declaration of '...
It appears that this error occurs when the implementation is already inside namespace foospace {...}and the implementation gives the namespace again int foospace::barfunction(int blah){return 17;}.
当实现已经在内部namespace foospace {...}并且实现再次提供命名空间时，似乎会发生此错误int foospace::barfunction(int blah){return 17;}。
Basically, if the implementation (the code in you .cpp file) is already inside namespace foospace {...}then remove foospace::from the function definition.
基本上，如果实现（.cpp 文件中的代码）已经在里面，namespace foospace {...}那么foospace::从函数定义中删除。
回答by O-9
Well, this is not an answer to this particular question, but because this is the first result on Google search when searching this error message, I just might tell that I got this error message when I had declared twice the namespace (when not needed) - like this
好吧，这不是这个特定问题的答案，但因为这是搜索此错误消息时 Google 搜索的第一个结果，所以我可能会告诉我，当我声明了两次命名空间时（不需要时），我收到了此错误消息- 像这样
error: explicit qualification in declaration of ...
错误：声明中的明确限定...
namespace foo {
// REMOVE THIS "foo::" from here
void foo::myFunction(int x) {
// ...
}
}
Beginner's mistake. Check your namespaces. It's either missing, many times declared or wrong namespace - I would assume.
初学者的错误。检查您的命名空间。它要么丢失，多次声明或错误的命名空间 - 我会假设。
回答by Bretzelus
Sorry if already mentioned above. I landed here because I've switched from MSVC (Windows) to my Archlinux installation for testing cross-compile effectively.
对不起，如果上面已经提到。我来到这里是因为我已经从 MSVC (Windows) 切换到我的 Archlinux 安装来有效地测试交叉编译。
So "Be Aware" that MSVC (Visual Studio) will be permissive using namespace extra qualifications - at least with the /W1 switch (level 1 warnings) thus ignoring the extra qualification (explicit namespace within itself). Notice that either in gcc; clang; msvc, this error does not happen to class members and function parameters and that is what confuses me about that extra qualification error only applied on "unit/file" functions...
所以“注意”MSVC (Visual Studio) 将允许使用命名空间额外限定 - 至少使用 /W1 开关（1 级警告）从而忽略额外限定（自身内的显式命名空间）。请注意，要么在 gcc; 铛; msvc，这个错误不会发生在类成员和函数参数上，这就是让我感到困惑的原因是那个额外的限定错误只适用于“单元/文件”函数......
