How can some code be run each time an exception is thrown in a Visual C++ program?

Question

If an exception is thrown in a C++ program control is either transferred to the exception handler or terminate() is called.

Even if the program emits so

Answer 1

When the language doesn't support it, and you can't live without it, hack... :-/

#include 
#include 

namespace Throw_From
{
    struct Line
    {
        Line& set(int x) { x_ = x; return *this; }
        int x_;

        template 
        void operator=(const T& t) const
        {                                                                       
            throw t;
        }                                                                       
    };                                                                          
    Line line;                                                                  
}                                                                               

#define throw Throw_From::line.set(__LINE__) =                                  

void fn2()                                                                      
{                                                                               
    throw std::runtime_error("abc");                                            
}                                                                               

void fn1()                                                                      
{                                                                               
    fn2();                                                                      
}                                                                               

int main()                                                                      
{                                                                               
    try
    {
        fn1();
    }
    catch (const std::runtime_error& x)
    {
        std::cout << Throw_From::line.x_ << '\n';
    }
}