A throw-expression with no operand in C++

    A throw-expression with no operand re-throws the exception currently being handled. Such an expression should appear only in a catch handler or in a function called from within a catch handler. The re-thrown exception object is the original exception object (not a copy). For example: 

 

try {    throw CSomeOtherException();}catch(...) {  // Handle all exceptions    // Respond (perhaps only partially) to exception    // ...    throw;       // Pass exception to some other handler}

 

 

 

   An empty throw statement tells the compiler that the function does not throw any exceptions. It is the equivalent to using __declspec(nothrow). For example:

// exceptions_trycatchandthrowstatements3.cpp void empty() throw(){   puts("In empty()");}void with_type() throw(int){   puts("Will throw an int");   throw(1);}int main(){   try {       empty();       with_type();   }catch (int){       puts("Caught an int");   }}