C++无try-catch的异常捕获示例详解

try {
  throw 1;
} catch (int x) {
  cout << "x " << x << endl;
  throw std::runtime_error("exception");
} catch (...) {
  cout << "exception" << endl;
}

void dep2() {
  cout << "ok" << endl;
  throw "error";
}
void dep1() {
  dep2();
  cout << "ok call dep2" << endl;
}
void func() {
  dep1();
  cout << "ok call dep1" << endl;
}
signed main() {
  try {
    func();
  } catch (...) {
    cout << "error" << endl;
  }
  return 0;
}

pair<int, string> dep2() {
  cout << "ok" << endl;
  return {-1, "error"};
  cout << "ret" << endl;
  return {0, ""};
}
pair<int, string> dep1() {
  auto[ret, err] = dep2();
  if (ret == -1) return {ret, err};
  cout << "ok call dep2" << endl;
  return {0, ""};
}
pair<int, string> func() {
  auto[ret, err] = dep1();
  if (ret == -1) return {ret, err};
  cout << "ok call dep1" << endl;
  return {0, ""};
}
signed main() {
  auto[ret, err] = func();
  if (ret == -1) cout << err << endl;
  return 0;
}

int func(int parameter, int* ret) {}

signed main() {
  for (int i = 1; i <= 1000; i++) {
    for (int j = 1; j <= 1000; j++) {
      for (int k = 1; k <= 1000; k++) {
        if (i == 11 && j == 22 && k == 555)
          goto end;
      }
    }
  }
  end:
  return 0;
}
signed main() {
  bool flag = true;
  for (int i = 1; i <= 1000 && flag; i++) {
    for (int j = 1; j <= 1000 && flag; j++) {
      for (int k = 1; k <= 1000 && flag; k++) {
        if (i == 11 && j == 22 && k == 555)
          flag = false;
      }
    }
  }
  return 0;
}

jmp_buf env;
signed main() {
  int stat = 0;
  if ((stat = setjmp(env)) == 1) {
    printf("1");
    return 1;
  }
  printf("0");
  longjmp(env, 1);
  return 0;
}
// 结果：
>. 01

#include <bits/stdc++.h>
#include <setjmp.h>
struct EXP {
  jmp_buf buf;
  int stat;
};
#define BEGIN_EXP(exp) switch (setjmp(exp.buf))
#define TRY(body) case 0: body break;
#define CATCH(exp, body) case exp: body break;
#define THROW(exp, data) longjmp(exp.buf, data)
int main() {
  EXP exp;
  BEGIN_EXP(exp) {
    TRY({
      std::cout << " data" << std::endl;
      THROW(exp, 1);
    })
    CATCH(1, {
      std::cout << "error 1" << std::endl;
      THROW(exp, 2);
    })
    CATCH(2, {
      std::cout << "error 2" << std::endl;
      THROW(exp, 3);
    })
    CATCH(3, {
      std::cout << "error 2" << std::endl;
    })
  }
  return 0;
}