Thread: Using <exception>, compiles in Visual Studio, massive errors in g++

Hi

I wrote some classes inheriting from <exception> in the following way:

Code:

class NoFile : public exception
{
public:
	NoFile();
	NoFile(string);
	NoFile(const NoFile &);
	virtual ~NoFile();
	NoFile operator=(const NoFile &);

	virtual const char* what() const;
	const char* getName() const;

private:
	const string reason;
	string fileName;
};

And I use it in other files like that:

Code:

try
	{
		ifstream inp(inputName);
		
		if(inp.is_open() == true)
		{
			//do something
		}
		else
		{
			throw NoFile(this->inputName);
		}
	}
	catch(const NoFile &e)
	{
		cerr << "Caught exception: " << e.what() << ": " << e.getName() << endl;
		cerr << "Returning to main menu" << endl << endl;
	}

There are some more, but written in the same way so I guess there is no need to post them here. Anyway, the code for the entire program compiles without any problems in Visual Studio 2010 but the g++ compiler gives me millions of errors, most of them of this kind:

Code:

error: looser throw specifier for 'virtual const char* NoFile::what() const

Why this happens? Do VS and g++ have different implementations of <exception>? How to avoid these errors?