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#include <iostream>
 
class MathException : std::exception
{
public:
    MathException(std::string &&whatStr) noexcept : whatStr(std::move(whatStr)) { }
    MathException(const std::string &whatStr) noexcept : whatStr(whatStr) { }
    ~MathException() noexcept;
 
    const char* what() const noexcept override;
 
private:
    std::string whatStr;
};
 
const char* MathException::what() const noexcept
{
    return whatStr.c_str();
}
 
int main()
try
{
	throw MathException("Parse Error");
}
catch(...)
{
 
}

/home/oviTGW/ccnJqtDF.o: In function `main':
prog.cpp:(.text.startup+0x39): undefined reference to `vtable for MathException'
prog.cpp:(.text.startup+0x3e): undefined reference to `MathException::~MathException()'
prog.cpp:(.text.startup+0x43): undefined reference to `typeinfo for MathException'
collect2: error: ld returned 1 exit status

Standard output is empty