[問題] 在class外面走後門存取private
問題(Question)：
在stackoverflow上面看到一個有趣的問題，只是不太了解為什麼可以，想知道原因。
safe.h
class safe
{
int money;
public:
safe()
: money(1000000)
{
}
template <typename T>
void backdoor()
{
// Do some stuff.
}
};
main.cpp:
#include <safe.h>
#include <iostream>
class key;
template <>
void safe::backdoor<key>()
{
// My specialization.
money -= 100000;
std::cout << money << "\n";
}
int main()
{
safe s;
s.backdoor<key>();
s.backdoor<key>();
}
Output:
900000
800000
==================================
class A
{
int a;
}
class B
{
public:
int b;
}
union
{
A a;
B b;
};
then B * b = reinterpret_cast<B*>(&a);
--
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