小问题，关于重载delete

[ed9er]

下面是Thinking in C++里的例子程序：

//: C13:GlobalOperatorNew.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Overload global new/delete
#include <cstdio>
#include <cstdlib>
using namespace std;

void* operator new(size_t sz) {
printf("operator new: %d Bytes\n", sz);
void* m = malloc(sz);
if(!m) puts("out of memory");
return m;
}

void operator delete(void* m) {
puts("operator delete");
free(m);
}

class S {
int i[100];
public:
S() { puts("S::S()"); }
~S() { puts("S::~S()"); }
};

int main() {
puts("creating & destroying an int");
int* p = new int(47);
delete p;
puts("creating & destroying an s");
S* s = new S;
delete s;
puts("creating & destroying S[3]");
S* sa = new S[3];
delete []sa;
} ///:~

然后是g++编译后运行的输出(Red Hat Linux release 6.1)：

[C13]$a.out
creating & destroying an int
operator new: 4 Bytes
operator delete
creating & destroying an s
operator new: 400 Bytes
S::S()
S::~S()
operator delete
creating & destroying S[3]
operator new: 1204 Bytes
S::S()
S::S()
S::S()
S::~S()
S::~S()
S::~S()
[C13]$

前面一切都好，问题是最后delete []sa的时候怎么没有输出operator delete？free了吗？

[gameboy999]

delete[]你又没有重载，
可能它用的是默认的那个，当然没有那句话出现了。

[ed9er]

哎，急性子，没办法，才过了十五分钟我就知道了