1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
#include <fstream>
#include <cstring>
class Reference
{
std::ostream &d_out;
public:
Reference(std::ostream &out)
:
d_out(out)
{}
void swap(Reference &other)
{
char buffer[sizeof(Reference)];
memcpy(buffer, this, sizeof(Reference));
memcpy(static_cast<void *>(this), &other, sizeof(Reference));
memcpy(static_cast<void *>(&other), buffer,
sizeof(Reference));
}
std::ostream &out()
{
return d_out;
}
};
int main()
{
std::ofstream one{ "one" };
std::ofstream two{ "two" };
Reference ref1{ one }; // ref1/ref2 hold references to
Reference ref2{ two }; // the streams
ref1.out() << "hello to 1\n"; // generate some output
ref2.out() << "hello to 2\n";
ref1.swap(ref2);
ref2.out() << "hello to 1\n"; // more output
ref1.out() << "hello to 2\n";
}
|
