Windows Linux c ++编译问题：“调用没有匹配功能”

Question

I am working on a tool that provides a facility to write small c++ code within the framework it provides. The tool is windows and linux based. We write code into the windows. The compilation is done first on windows for testing purposes. Finally a linux build is performed to actually run the whole production tests on linux.

I created a function with following signature:

string myClass::myFunc(string& start, bool myflag, Class C1 & c1,
    long a=0, const char* b=NULL, void * c=NULL);

Now when the tool runs on windows (Microsoft visual express) everything works fine and all tests pass.

However when the code is compiled on linux I get an error stating that "no matching function for call".

Here is the function signature:

string myClass::myFunc(string& start, bool myflag, Class C1 & c1,
    long a=0, const char* b=NULL, void * c=NULL);

Error message:

myfile.cpp: no matching function for call to 
myClass::myFunc(std::string, bool, classC1&, long int&, 
const char *&, void*&) 

myfile.h: note: candidates are: 
std::string myClass:myFunc(std::string&, bool&, classC1&, 
long int, const char*, void*)

I do not have any access to the linux server. Hence cannot mention the linux distro or any other details.

Thanks in advance.

• ftp

Answer 1

Microsoft's C++ compiler incorrectly allows binding non- const references to temporary variables. They won't fix the bug now, because it would break existing code. But that code already is broken on conformant compilers, as you've discovered.

See if you can't pass by value (for small types) or by const reference (for ones that are expensive to copy). If it's an output argument, you'll need to change the caller to pass an lvalue instead of a temporary.