CODEWITHSUNDEEP
c++macosconstructorcompiler-errorsclang
Abiud Rds
Abiud Rds

Reputation: 129

C++ error: no matching constructor for initialization of "my:Library" with Clang 11.0.3

I have been several post with something similar to my problem but I can't figure out how to solve it in my implementation.

It's about a custom exception classes that compile perfectly in Linux with gcc 9, but in MacOs (Catalina) with Clang 11.0.3 fails dramatically.

Here is the code:

    #include <stdexcept>
        
    class Exception : public std::runtime_error
  {
    public:
        Exception() : std::runtime_error("mt library error") {}
        Exception(const std::string& what_arg) : std::runtime_error(what_arg) {}
    };
    
    
    /// Division by zero exception.
    class ZeroDivide : public Exception
    {
    public:
        ZeroDivide() : Exception("Division by near-zero value") {}
    };

When compile in MacOS I get the error:

error: no matching constructor for initialization of 'mt::Exception'
    ZeroDivide() : Exception("Division by near-zero value") {}
                   ^         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

and different notes like:

candidate constructor (the implicit copy constructor) not viable: no known conversion from 'const char [36]' to 'const mt::Exception' for 1st argument

and other errors derived from the first one when I try to throw the exception like:

Exception("Normalizing interval is ill defined")

I have seen some examples like this of how could fix the problem but I can not figure out how to reimplement mine in order to make it work in MacOs

Somebody can help me?

Thanks in advance.

Edit

As the project is big, I have created a repository here with a minimal example to reproduce the error, you just have to compile following this steps

mkdir build
cd build
cmake ..
make

Upvotes: 1

Views: 1453

Answers (1)

Lyubomir Vasilev
Lyubomir Vasilev

Reputation: 3030

It looks like your compiler is complaining that it won't automatically convert the hardcoded string "Division by near-zero value" that you provide to the constructor of Exception from const char* to const std::string&.

I have no access to macos at the moment but my guess is that you could fix it by constructing a std::string at the place of calling the base constructor:

ZeroDivide() : Exception(std::string("Division by near-zero value")) {}

Another possible fix is to define a constructor in Exception that takes a const char*:

Exception(const char* what_arg) : std::runtime_error(what_arg) {}

This might be the better fix, as std::runtime_error actually has both constructors for const char* and for const std::string&.

Upvotes: 2

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