?? copymem.cpp
字號:
//: C12:Copymem.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Duplicate during assignment
#include "../require.h"
#include <cstdlib>
#include <cstring>
using namespace std;
class WithPointer {
char* p;
static const int blocksz = 100;
public:
WithPointer() {
p = (char*)malloc(blocksz);
require(p != 0);
memset(p, 1, blocksz);
}
WithPointer(const WithPointer& wp) {
p = (char*)malloc(blocksz);
require(p != 0);
memcpy(p, wp.p, blocksz);
}
WithPointer&
operator=(const WithPointer& wp) {
// Check for self-assignment:
if(&wp != this)
memcpy(p, wp.p, blocksz);
return *this;
}
~WithPointer() {
free(p);
}
};
int main() {
WithPointer p;
WithPointer p2 = p; // Copy construction
p = p2; // Assignment
} ///:~
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