[C++] noexcept

개요

• 예외가 발생하지 않는 함수에 정의
• void func5() noexcept {}
• 해당 함수에서 예외 발생 시 catch 되지 않고 크러쉬

예제

• 코드

   #include <iostream>
   #include <string>
      
   using namespace std;
      
   void func1();
   void func2();
   void func3();
      
   class Test {
   	private:
   		int i;
      
   	public:
   		Test(int i) : i(i) {}
   		~Test() { cout << "~Test() - " << this->i << endl; }
      
   		void func(){};
   };
      
   void func1() {
   	cout << "func1() start" << endl;
   	func2();
   	cout << "func1() end" << endl;
   }
   void func2() {
   	cout << "func2() start" << endl;
   	func3();
   	cout << "func2() end" << endl;
   }
   void func3() {
   	cout << "func3() start" << endl;
      
   	Test t1(1);
   	Test *t2 = new Test(2);
   	t2->func();
      
   	throw out_of_range("aaa");
      
   	cout << "func3() end" << endl;
   }
      
   void func4(const int &i) {
   	switch (i) {
   	case 1:
   		throw 1;
   	case 2:
   		throw 'c';
   	case 3:
   		throw "aaa";
   	case 4:
   		throw string("bbb");
   	default:
   		throw out_of_range("ccc");
   	}
   }
      
   void func5() noexcept {}
      
   int main() {
   	try {
   		func1();
   		cout << "func() after" << endl;
   	} catch (out_of_range &e) {
   		cout << e.what() << endl;
   	}
      
   	try {
   		func4(1);
   	} catch (int &i) {
   		cout << "i : " << i << endl;
   	} catch (char &c) {
   		cout << "c : " << c << endl;
   	} catch (const char *pc) {
   		cout << "pc : " << pc << endl;
   	} catch (string &s) {
   		cout << "s : " << s << endl;
   	} catch (...) {
   		cout << "other catch" << endl;
   	}
      
   	func5();
      
   	cout << "main end" << endl;
      
   	return 0;
   }
  

• 실행 결과

   func1() start
   func2() start
   func3() start
   ~Test() - 1
   aaa
   i : 1
   main end