57 lines
1.3 KiB
C++
57 lines
1.3 KiB
C++
/* C++ exception handling example
|
|
|
|
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
|
|
|
Unless required by applicable law or agreed to in writing, this
|
|
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
CONDITIONS OF ANY KIND, either express or implied.
|
|
*/
|
|
|
|
#include <iostream>
|
|
|
|
using std::cout;
|
|
using std::endl;
|
|
using std::runtime_error;
|
|
|
|
/* A simple class which may throw an exception from constructor */
|
|
class Throwing
|
|
{
|
|
public:
|
|
Throwing(int arg)
|
|
: m_arg(arg)
|
|
{
|
|
cout << "In constructor, arg=" << arg << endl;
|
|
if (arg == 0) {
|
|
throw runtime_error("Exception in constructor");
|
|
}
|
|
}
|
|
|
|
~Throwing()
|
|
{
|
|
cout << "In destructor, m_arg=" << m_arg << endl;
|
|
}
|
|
|
|
protected:
|
|
int m_arg;
|
|
};
|
|
|
|
/* Inside .cpp file, app_main function must be declared with C linkage */
|
|
extern "C" void app_main()
|
|
{
|
|
cout << "app_main starting" << endl;
|
|
|
|
try {
|
|
/* This will succeed */
|
|
Throwing obj1(42);
|
|
|
|
/* This will throw an exception */
|
|
Throwing obj2(0);
|
|
|
|
cout << "This will not be printed" << endl;
|
|
} catch (const runtime_error &e) {
|
|
cout << "Exception caught: " << e.what() << endl;
|
|
}
|
|
|
|
cout << "app_main done" << endl;
|
|
}
|