链接器错误-不确定它没有链接

时间：2018-09-08 12:45:10

标签： c++ linker linker-errors

我一直试图找出代码中未正确链接或声明的内容。我正在使用C ++编写一个简单的游戏引擎以用于学习目的，并试图创建一个状态机。链接器错误与unordered_list，list或map有关。我不确定哪个。错误是针对带有两个参数的构造函数的，这两个参数是两个typedef，并且包含在我显示的代码中，当我调用该构造函数时会发生错误。

IState.h 

#ifndef ZX_STATE_H
#define ZX_STATE_H

#include "coreDefines.h"
#include "zxstring.h"
ZX_NS_START

class IState
{
    tstring pm_name;
public:
    const tstring& name();
    virtual ~IState() = default;
    virtual void Pre() = 0;
    virtual void Run() = 0;
    virtual void Post() = 0;
};

ZX_NS_END
#endif

IStateMachine.h 

#ifndef ZX_ISTATEMACHINE_H
#define ZX_ISTATEMACHINE_H
#include "object.h"
#include "zxstring.h"
#include "IState.h"
#include <unordered_set>
#include <map>
#include <list>

ZX_NS_START
typedef std::map<tstring, IState*> StateMap;
typedef std::unordered_set<tstring> StateSet;
typedef std::list<StateSet> RunOrder;
class IStateMachine : object, IState
{
public:
    const tstring defaultState = T("zx default state");

    IStateMachine();
    IStateMachine(RunOrder** runOrder, StateSet** states);
    virtual ~IStateMachine();
    void Add(IState* state);
    void Remove(IState* state);

private:
    StateMap pm_states;
    RunOrder** pm_runOrder;
    StateSet** pm_activeStates;

    void Pre() override;
    void Run() override;
    void Post() override;

    void SetUpDefaultState();
    class DefaultState: IState
    {
        IStateMachine* pm_parent;
    public:
        DefaultState();
        explicit DefaultState(IStateMachine* parent);
        void Pre() override;
        void Run() override;
        void Post() override;
    };
};

ZX_NS_END
#endif

IStateMachine.cpp 

#include "IStateMachine.h"
USINGZX;

IStateMachine::IStateMachine(): pm_states(StateMap()), pm_runOrder(nullptr), pm_activeStates(nullptr)
{
    SetUpDefaultState();
}

IStateMachine::IStateMachine(RunOrder** runOrder, StateSet** states) : pm_states(StateMap()), pm_runOrder(runOrder), pm_activeStates(states)
{
    SetUpDefaultState();
}

IStateMachine::~IStateMachine()
{
    delete pm_states[defaultState];
}


void IStateMachine::Add(IState* state)
{
    pm_states.insert(std::make_pair(state->name(), state));
}

void IStateMachine::Remove(IState* state)
{
    pm_states.erase(state->name());
}


void IStateMachine::Pre()
{
    pm_states[defaultState]->Pre();
}

void IStateMachine::Run()
{
    pm_states[defaultState]->Run();
}

void IStateMachine::Post()
{
    pm_states[defaultState]->Post();
}

void IStateMachine::SetUpDefaultState()
{
    DefaultState* def = new DefaultState(this);
    pm_states.insert(std::make_pair(defaultState, (IState*)def));
}

IStateMachine::DefaultState::DefaultState() :pm_parent(nullptr)
{
}

IStateMachine::DefaultState::DefaultState(IStateMachine* parent): pm_parent(parent)
{
}

void IStateMachine::DefaultState::Pre()
{
    for(const auto& states : **pm_parent->pm_runOrder)
    {
        for(const auto& runState : states)
        {
            pm_parent->pm_states[runState]->Pre();
        }
    }
}

void IStateMachine::DefaultState::Run()
{
    for(const auto& states: **pm_parent->pm_runOrder)
    {
        for(const auto& runState : states)
        {
            pm_parent->pm_states[runState]->Run();
        }
    }
}

void IStateMachine::DefaultState::Post()
{
    for (const auto& states : **pm_parent->pm_runOrder)
    {
        for (const auto& runState : states)
        {
            pm_parent->pm_states[runState]->Post();
        }
    }
}

这是很长的...错误消息

错误LNK2019无法解析的外部符号“ public：__thiscall Zx :: IStateMachine :: IStateMachine（class std :: list，class std :: allocator>，struct std :: hash，class std :: allocator>>，struct std： ：equal_to，类std :: allocator>>，类std :: allocator，类std :: allocator>>>，类std :: allocator，类std :: allocator>，结构std :: hash，类std :: allocator >>，struct std :: equal_to，class std :: allocator>>，class std :: allocator，class std :: allocator>>>>> * *，class std :: unordered_set，class std :: allocator>，struct std :: hash，class std :: allocator>>，struct std :: equal_to，class std :: allocator>>，class std :: allocator，class std :: allocator>>> * *）“（?? 0IStateMachine @ Zx @@ QAE @ PAPAV？$ list @ V？$ unordered_set @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@ U？$ hash @ V？ $ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ U？$ equal_to @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V $ allocator @ _W @ 2 @@ std @@@@ 2 @ V？$ allocator @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @ @std @@@ 2 @@ std @@ V？$ allocator @ V？$ unordered_set @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@ U $ hash @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ U？$ equal_to @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ V？$ allocator @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @ @std @@@@ 2 @@ std @@@ 2 @@ std @@ PAPAV？$ unordered_set @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @ @U？$ hash @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@@ 2 @ U？$ equal_to @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ V？$ allocator @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @函数“ public：__thiscall TestStateMachine :: TestStateMachine（class std :: list，class std :: allocator>，struct std :: hash，class std ::''中引用的2 @@ std @@@@ 2 @@ 3 @@ Z））分配器>>，结构std :: equal_to，类std :: allocator>>，类std :: allocator，类std :: allocator>>>，类std :: allocator，类std :: allocator>，结构std： ：hash，class std :: allocator>>，struct std :: equal_to，class std :: allocator>>，class std :: allocator，class std :: allocator>>>>> * *，class std :: unordered_set，类std :: allocator>，结构std :: hash，类std :: allocator>>，结构std :: equal_to，类std :: allocator>>，类std :: allocator，类std :: allocator>>> * *）“（?? 0TestStateMachine @@ QAE @ PAPAV？$ list @ V？$ unordered_set @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@ U $ hash @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ U？$ equal_to @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ V？$ allocator @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @ @std @@@ 2 @@ std @@ V？$ allocator @ V？$ unordered_set @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@ U $ hash @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ U？$ equal_to @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ V？$ allocator @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ alloca tor @ _W @ 2 @@ std @@@ 2 @@ std @@@ 2 @@ std @@ PAPAV？$ unordered_set @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@ U？$ hash @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ U？$ equal_to @ V？ $ basic_string @ _WU？$ char_traits @ _W @ std @@ V？$ allocator @ _W @ 2 @@ std @@@ 2 @ V？$ allocator @ V？$ basic_string @ _WU？$ char_traits @ _W @ std @@ V ？$ allocator @ _W @ 2 @@ std @@@ 2 @@ 2 @@ Z）

我通常可以很容易地弄清楚这些，但是出于某种原因，这让我很沮丧（也许与错误消息中的不可读类型有关）

我认为这不会有任何后果，但是，这是调用链接器错误的测试代码

StateMachineTest.cpp 

class TestStateMachine : zx IStateMachine
{
public:
    TestStateMachine(zx RunOrder** order, zx StateSet** active) : zx IStateMachine(order, active)
    {

    }
};

TEST_CLASS(StateMachineTest)
{
public:
    TEST_METHOD(IStateMachineTest)
    {
        auto* order = new zx RunOrder();
        auto* active = new zx StateSet();



        TestStateMachine test = TestStateMachine(&order, &active);
    }

};

2 个答案:

答案 0 :(得分：0)

假设USINGZX为using namespace zx;，则此代码未在IStateMachine::IStateMachine命名空间中定义zx，而是在全局命名空间中。 

USINGZX;

IStateMachine::IStateMachine(): pm_states(StateMap()), pm_runOrder(nullptr), pm_activeStates(nullptr)
{
    SetUpDefaultState();
}

如果您想在IStateMachine::IStateMachine命名空间中定义zx，那么您要么不得不说

zx::IStateMachine::IStateMachine(): pm_states(StateMap()), pm_runOrder(nullptr), pm_activeStates(nullptr)
{
    SetUpDefaultState();
}

或

namespace zx {

IStateMachine::IStateMachine(): pm_states(StateMap()), pm_runOrder(nullptr), pm_activeStates(nullptr)
{
    SetUpDefaultState();
}

}

答案 1 :(得分：0)

我删除了所有宏内容，并删除了缺少头文件的#include，提供了tstring之类的typedef std::basic_string<TCHAR> tstring;的替代品，以及const tstring& IState::name() { return pm_name; }的实现，并且代码得以编译没有错误。

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