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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. protected:
  21.     int value_; // この値は不可侵である
  22. };
  23.  
  24. class HogeSDKClassHack : public HogeSDKClass {
  25. public:
  26. 	void hackValue() {
  27. 		this->value_ = 1000;
  28. 	}
  29.  
  30. };
  31.  
  32. HogeSDKClass* getHogeSDKInstance() {
  33. 	return new HogeSDKClass(); // これはSDKからやってくる
  34. }
  35.  
  36. int main() {
  37.     HogeSDKClass* hoge = getHogeSDKInstance();
  38.     hoge->print(); // この値を書き換えたい……。
  39.  
  40.     HogeSDKClassHack* hogeHack = static_cast<HogeSDKClassHack*>(hoge);
  41.  
  42.     hogeHack->hackValue();
  43.     hogeHack->print();
  44.  
  45. 	return 0;
  46. }
Success #stdin #stdout 0s 3472KB
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stdin
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Standard input is empty
stdout
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9999
1000
https://ideone.com/bH5rGd
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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