c++ - 没有仅在不同文件中创建对象时出现的匹配函数调用

Question

我目前在 C++ 中遇到一个不匹配的函数调用错误，内容如下

TestSuiteAssignment4.cpp: In function ‘int main()’:
TestSuiteAssignment4.cpp:533: error: no matching function for call to 
‘CreatureStack::CreatureStack(Creature*&)’
CreatureStack.hpp:32: note: candidates are: 
CreatureStack::CreatureStack(Creature*, CreatureStack*)
CreatureStack.hpp:31: note: CreatureStack::CreatureStack()
CreatureStack.hpp:18: note: CreatureStack::CreatureStack(const CreatureStack&)

.

奇怪的是，当我通过 CreatureStack 的实现文件中的 main 函数创建对象时，我没有遇到任何这些错误。只有当我尝试在 TestSuiteAssignment4.cpp 文件中创建一个对象时，我才会收到此错误。

这是 CreatureStack.hpp 文件。

class CreatureStack
{
     private: 
         CreatureStack* next;
    CreatureStack* last;
    CreatureStack* first;
    Creature* item;

public:
    int count;
    Creature* remove();
    void add(Creature* item);
    bool empty();
    int returnCount();
    CreatureStack();
    CreatureStack(Creature* creature, CreatureStack* nextArg);

};

这里是实现文件CreatureStack.cpp中CreatureStack的构造函数

#include <iostream>
#include "CreatureStack.hpp"
#include "Creature.hpp"
#include "Goblin.hpp"


 /****************************************************************************
 ** Function: default constructor
 ** Description: constructs instacklist object
 ** Parameters: none
 ** Pre-conditions: no object created
 ** Post-conditions: object created
 ****************************************************************************/


CreatureStack::CreatureStack()
{
}



 /****************************************************************************
 ** Function: constructor
 ** Description: constructs object with arguments
 ** Parameters: int item, and pointer to next intstacklist object
 ** Pre-conditions: no object created
 ** Post-conditions: object created
 ****************************************************************************/



 CreatureStack::CreatureStack(Creature* creature, CreatureStack* nextArg = NULL)
 {
/*initiate object with the item argument, and a pointer to an IntStackList Object for Next */

item = creature;
next = nextArg;
count = 1;
last = this;
}

这是 CreatureStack 实现文件的主要文件

int main()
{


Creature* test1 = new Goblin();
Creature* test2 = new Goblin();
Creature* test3 = new Goblin();

Creature* testPoint;

test1->setId(1);
test2->setId(2);
test3->setId(3);

CreatureStack stack1 = CreatureStack(test1);
stack1.add(test2);
stack1.add(test3);
}

当我运行这些代码行时，根本没有构造函数问题/编译问题。

只有当我创建一个新文件 TestSuiteAssignment4.cpp 时，我才遇到构造函数的编译错误。

在新文件中，我只有以下代码。

#include <iomanip>
#include <string>
#include <vector>
#include <cstdlib>
#include "Dice.hpp"
#include "CreatureStack.hpp"
#include "CreatureQueue.hpp"
#include "Creature.hpp"
#include "Goblin.hpp"

int main()
{

    Creature* test1 = new Goblin();
    Creature* test2 = new Goblin();
    Creature* test3 = new Goblin();

    Creature* testPoint;

    test1->setId(1);
    test2->setId(2);
    test3->setId(3);

    CreatureStack stack1 = CreatureStack(test1);
    stack1.add(test2);
    stack1.add(test3);

}

当我尝试编译 TestSuiteAssignment4.cpp 时遇到的无匹配函数错误调用让我感到困惑，因为当我尝试在 CreatureStack 实现文件中创建 CreatureStack 对象时，我完全没有遇到任何问题。但是，当我将完全相同的代码放入 TestSuiteAssignment4.cpp 时，我得到了一个匹配的函数调用错误，在实现文件中进行测试时根本不会出现这个错误。

感谢任何可能的帮助。

Answer 1

您应该将默认值(如下)移动到头文件

CreatureStack::CreatureStack(Creature* creature, CreatureStack* nextArg = NULL)