Search(c++在线运行)
C++
sizeof(C1)=16 sizeof(C1*)=8
h 20 @ 00 00 00 00 00 C + + 00 _ _ _ _ _ _ _ _ P 20 @ 00 00 00 00 00 C P P 00 _ _ _ _ _ _ _ _ P 20 @ 00 00 00 00 00 C X X 00 _ _ _ _ _ _ _ _ _ _ _ _
XXX
#include <string.h> #include <stdio.h> #include <new> typedef unsigned char byte; struct C1 { char m_str[5]; C1(const char* s) { strcpy(m_str, s); } virtual void print() { puts(m_str); } }; struct C2 : public C1 { C2(const char* s) : C1(s) {} virtual void print() { puts(m_str); } }; int main() { enum { N = 64 }; byte buf[N]; memset(buf, '_', N); C1 *p = new(buf)C1("C++"), *q = new(buf + 20)C2("CPP"); C2 *r = new(buf + 40)C2("CXX"); p->print();printf("sizeof(C1)=%d sizeof(C1*)=%d\n", sizeof(C1), sizeof(C1*)); for (byte* p = buf; p < buf + N; p++) { const byte b = *p; if (b > 32) printf("%c ", b); else printf("%02x ", b); } puts(""); if (byte *pb = (byte*)memmem(buf, N, "CXX", 3)) (*pb = 'X'), r->print(); return 0; }