CODEWITHSUNDEEP
c++charconstants
Shang Wang
Shang Wang

Reputation: 25559

passed in const char* to a method but got char const * error instead

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.

Upvotes: 0

Views: 190

Answers (1)

Carl Norum
Carl Norum

Reputation: 225162

char const * and const 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 function benchmark::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?

Upvotes: 1

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