每次更改代码后都无法解析外部符号
我的代码有问题。它基本上看起来像这样：
someclass.hpp:
class SomeClass
{
public:
SomeClass();
~SomeClass();
//... some other methods
};
someclass.cpp:
#include "SomeClass.hpp"
SomeClass::SomeClass()
{
}
SomeClass::~SomeClass()
{
}
SomeClass.cpp 不包含其他任何内容。
构造函数实际上也是空的。我只是不想让它们未定义或保留标准构造函数，因为我稍后可能会需要它。
SomeClass.hpp 实际上是一个游戏状态类，仅包含在一个位置：
main.cpp
#include "SomeClass.hpp"
int main()
{
DoSomethingWithGamestate(new SomeClass());
return 0;
}
然后该项目由许多其他文件组成，但所有这些文件都独立于 SomeClass。
问题是，每当我更改代码中的任何内容时，无论在哪个文件中，我都必须重新编译整个解决方案，因为如果我只编译更改，链接器会抛出以下错误：
error LNK2001: unresolved external symbol "public: __thiscall SomeClass::SomeClass(void) (??blablaSomeClassblabla)
显然，这里发生了一些奇怪的事情，因为 SomeClass()在 someclass.cpp 中明确定义。
这可能是什么原因？
I've got a problem with my code. It basically looks like this:
someclass.hpp:
class SomeClass
{
public:
SomeClass();
~SomeClass();
//... some other methods
};
someclass.cpp:
#include "SomeClass.hpp"
SomeClass::SomeClass()
{
}
SomeClass::~SomeClass()
{
}
SomeClass.cpp doesn't include anything else.
The constructors are actually empty, too. I just don't want to leave them undefined or leave the standard constructor because I'm probably going to need it later.
SomeClass.hpp is actually a gamestate class which is included in only one place:
main.cpp
#include "SomeClass.hpp"
int main()
{
DoSomethingWithGamestate(new SomeClass());
return 0;
}
And then the project consists of a lot of other files, all of which are independent from SomeClass, though.
The problem is that whenever I change anything in the code, no matter in which file, I have to recompile the entire solution because if I only compile the changes the linker throws this:
error LNK2001: unresolved external symbol "public: __thiscall SomeClass::SomeClass(void) (??blablaSomeClassblabla)
Obviously, there's something weird going on here, since SomeClass() is clearly defined in someclass.cpp.
What could be the source of this?
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除了 @Nawaz 所说的之外，您的构建文件可能与链接器不同步，因此当 Visual Studio 重新链接时，它不能，因为文件不同步。只需重新构建并完成即可。
顺便说一句，它甚至可能是 Visual Studio 2010 中的一个错误 如此处所示。
In addition to what @Nawaz says, it's likely your build files are out of sync with the linker so that when Visual Studio goes to re-link, it can't because the files are out of sync. Just re-build and be done with it.
By the way, it may even be a bug in Visual Studio 2010 as seen here.