将 const char* 传递给方法，但得到 char const * 错误
我的 C++ 代码遇到了有线问题。我正在使用 TCLAP 软件接受命令行参数，其中一个标志是文件名：
TCLAP::ValueArg<string> Poly ("p", "poly", "file name of the polynomial", false, "", "string");
我还有另一个接受 3 个参数的函数，
void GetBiPoly(const char *filename, BiPoly<BigFloat> *u, BiPoly<BigFloat> *v);
我将 Poly 字符串传递给函数 GetBiPoly这样：
benchmark::GetBiPoly(Poly.getValue().c_str(), &fxy, &gxy);
当我编译程序时，它给我以下错误：
miranda.cpp:(.text+0x1900): undefined reference to `benchmark::GetBiPoly(char const*, CORE::BiPoly<CORE::BigFloat>*, CORE::BiPoly<CORE::BigFloat>*)'
似乎唯一的区别是错误信息中文件名的类型是 char const* ，而定义是常量字符*。谁能告诉我这似乎是什么问题？谢谢。
I encountered a wired problem on my C++ code. I'm using TCLAP software to accept command line arguments, and one of the flags is a file name:
TCLAP::ValueArg<string> Poly ("p", "poly", "file name of the polynomial", false, "", "string");
I also have another function that accepts 3 parameters,
void GetBiPoly(const char *filename, BiPoly<BigFloat> *u, BiPoly<BigFloat> *v);
I'm passing the Poly string to the function GetBiPoly in this way:
benchmark::GetBiPoly(Poly.getValue().c_str(), &fxy, &gxy);
When I compile the program, it gives me the following error:
miranda.cpp:(.text+0x1900): undefined reference to `benchmark::GetBiPoly(char const*, CORE::BiPoly<CORE::BigFloat>*, CORE::BiPoly<CORE::BigFloat>*)'
It seems like the only difference is that the type of the file name in the error information is char const*, while the definition is const char*. Can anybody tell me what the problem it seems to be? Thanks.
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char const *和const char *完全相同。您的问题与消息的那部分无关。您的错误是您正在调用函数benchmark::GetBiPoly()，但链接器无法在您链接的对象中找到它。该函数在哪里定义的？你正在链接它吗？它在那个命名空间中吗？char const *andconst char *are exactly the same thing. Your problem is not related to that part of the message. Your error is that you're calling the functionbenchmark::GetBiPoly(), but the linker can't find it in the objects you're linking. Where is that function defined? Are you linking it? Is it in that namespace?