我在g 4.6.2(mingw)上运行g -std = c 0x pod_test.cpp.我在A4上收到错误.为什么不是A4 POD？
#include <iostream>
#include <new>
#include <cstring>
using namespace std;
struct A {
int a,b;
char c;
};
struct A2 {
short buf[1];
};
struct A3:A {
};
struct A4:A {
short buf[1];
};
static_assert(std::is_pod<A>::value,"Struct must be a POD type");
static_assert(std::is_pod<A2>::value,"Struct must be a POD type");
static_assert(std::is_pod<A3>::value,"Struct must be a POD type");
static_assert(std::is_pod<A4>::value,"Struct must be a POD type");
int main(){}
解决方法
它不是POD,因为它违反了标准布局类的规则：
— either has no non-static data members in the most derived class and
at most one base class with non-static data members,or has no base
classes with non-static data members
继承格中只有一个类可以有非静态数据成员.在这种情况下,两者都是A和A4有.
