多重继承(multiple inheritance)歧义(ambiguous)
本文地址: http://blog.csdn.net/caroline_wendy/article/details/23737553
多重继承, 如果基类(base class)的成员函数名称相同,重载(overload)函数调用, 会忽略public和private, 选取最佳的匹配函数,
匹配度相同, 则会造成歧义, 产出错误:request for member 'xxx' is ambiguous, (GCC)
如需使用, 可以添加具体的域操作符, 指定类("class::method()").
代码如下:
/*
* test.cpp
*
* Created on: 2014.04.14
* Author: Spike
*/
/*eclipse cdt, gcc 4.8.1*/
#include <iostream>
#include <string>
using namespace std;
class BorrowableItem {
public: //共有
void checkout() { std::cout << "BorrowableItem" << std::endl; }
};
class ElectronicGadget {
private: //私有
bool checkout() const { return true; };
};
class MP3Player:
public BorrowableItem,
public ElectronicGadget
{};
int main() {
MP3Player mp;
mp.BorrowableItem::checkout(); //不添加域操作符会产生歧义
return 0;
}
输出:
BorrowableItem