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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.   int* ptr = new int;
  6.  
  7.   cout << "before: " << ptr << ":" << *ptr << endl; //這行拿掉就會crash
  8.   delete ptr;
  9.   *ptr     = 123;
  10.   cout << "read after free: " << ptr << ":" << *ptr << endl;
  11.   *ptr = 456; // write after free
  12.   cout << "read after free: "<< ptr << ":" << *ptr << endl;
  13.   return 0;
  14. }
Success #stdin #stdout 0s 4520KB
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stdin
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Standard input is empty
stdout
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before: 0x5611cca61c20:0
read after free: 0x5611cca61c20:123
read after free: 0x5611cca61c20:456
https://ideone.com/HKYiIQ
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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