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  1. #include <iostream>
  2. #include <sstream>
  3. #include <vector>
  4. #include <string>
  5. #include <map>
  6. #include <unordered_map>
  7. #include <sys/time.h>
  8. using namespace std;
  9.  
  10. class HogeSDKClass {
  11. public:
  12.     HogeSDKClass()
  13.     : value_(9999)
  14.     {
  15.  
  16.     }
  17. 	void print() {
  18. 		printf("%d\n", value_);
  19. 	}
  20. private:
  21.     int value_; // この値は不可侵である
  22. };
  23.  
  24. class HogeSDKClassHack {
  25. public:
  26. 	void hackValue() {
  27. 		this->value_ = 1000;
  28. 	}
  29. protected:
  30.     int value_; // 不可侵な値のダミー
  31. };
  32.  
  33. HogeSDKClass* getHogeSDKInstance() {
  34. 	return new HogeSDKClass(); // これはSDKからやってくる
  35. }
  36.  
  37. int main() {
  38.     HogeSDKClass* hoge = getHogeSDKInstance();
  39.     hoge->print(); // この値を書き換えたい……。
  40.  
  41.     HogeSDKClassHack* hogeHack = reinterpret_cast<HogeSDKClassHack*>(hoge);
  42.  
  43.     hogeHack->hackValue();
  44.     hoge->print();
  45.  
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 3472KB
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Standard input is empty
stdout
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9999
1000
https://ideone.com/aHQ8st
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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