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How to throw a C++ exception - Stack Overflow
- Viewed 622k times520edited Mar 2, 2021 at 15:02
Simple:
#include <stdexcept>int compare( int a, int b ) {if ( a < 0 || b < 0 ) {throw std::invalid_argument( "received negative value" );}}The Standard Library comes with a nice collection of built-in exception objects you can throw. Keep in mind that you should always throw by value and catch by reference:
try {compare( -1, 3 );}catch( const std::invalid_argument& e ) {// do stuff with exception...}You can have multiple catch() statements after each try, so you can handle different exception types separately if you want.
You can also re-throw ...
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