(删除了原始文本,因为它与已经回答的当前问题无关。请参阅修订。)
这是我的示例 test.hpp
(已简化):
class House {
private:
int nWindows;
public:
House(int nWindows);
int getNumberOfWindows();
};
class PaintedHouse : public virtual House {
private:
int colorCode;
public:
PaintedHouse(int nWindows, int colorCode);
int getColorCode();
};
class OccupiedHouse : public virtual House {
private:
int nPeople;
public:
OccupiedHouse(int nWindows, int nPeople);
int getNumberOfPeople();
};
class PaintedOccupiedHouse : public PaintedHouse, OccupiedHouse {
public:
PaintedOccupiedHouse(int nWindows, int colorCode, int nPeople);
};
和test.cpp
:
#include "test.hpp"
House::House(int nWindows) { this->nWindows = nWindows; }
int House::getNumberOfWindows() { return this->nWindows; }
PaintedHouse::PaintedHouse(int nWindows, int colorCode) : House(nWindows) {
this->colorCode = colorCode;
}
int PaintedHouse::getColorCode() { return this->colorCode; }
OccupiedHouse::OccupiedHouse(int nWindows, int nPeople) : House(nWindows) {
this->nPeople = nPeople;
}
int OccupiedHouse::getNumberOfPeople() { return this->nPeople; }
PaintedOccupiedHouse::PaintedOccupiedHouse(int nWindows, int colorCode, int nPeople)
: PaintedHouse(nWindows, colorCode), OccupiedHouse(nWindows, nPeople) {}
GCC 返回:
test.cpp: In constructor ‘PaintedOccupiedHouse::PaintedOccupiedHouse(int, int, int)’:
test.cpp:18:72: error: no matching function for call to ‘House::House()’
: PaintedHouse(nWindows, colorCode), OccupiedHouse(nWindows, nPeople) {}
^
test.cpp:18:72: note: candidates are:
test.cpp:4:1: note: House::House(int)
House::House(int nWindows) { this->nWindows = nWindows; }
^
test.cpp:4:1: note: candidate expects 1 argument, 0 provided
In file included from test.cpp:2:0:
test.hpp:2:7: note: constexpr House::House(const House&)
class House {
^
test.hpp:2:7: note: candidate expects 1 argument, 0 provided
test.hpp:2:7: note: constexpr House::House(House&&)
test.hpp:2:7: note: candidate expects 1 argument, 0 provided
你能告诉我我做错了什么吗?一般概念是否正确?
最佳答案
替换
PaintedOccupiedHouse::PaintedOccupiedHouse(int nWindows, int colorCode, int nPeople)
: PaintedHouse(nWindows, colorCode), OccupiedHouse(nWindows, nPeople) {}
通过
PaintedOccupiedHouse::PaintedOccupiedHouse(int nWindows, int colorCode, int nPeople)
: House(nWindows), PaintedHouse(nWindows, colorCode), OccupiedHouse(nWindows, nPeople) {}
当你有虚拟继承时,只有一个virtual
基类的实例。它必须在正在构造的最派生类的构造函数中初始化。
关于c++ - 一个基类的多重继承,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27910002/