调用静态重载（类）函数/方法是不明确的

Question

在我的C ++类中，我有两个静态方法，称为getInstance。

方法声明如下：

public: // +++ STATIC +++
    static CanCommunicator* getInstance(shared_ptr<ThreadState> state);
    static CanCommunicator* getInstance();

在全局函数中（由于遗留代码需要），我从对象调用getter：

auto tState = CanCommunicator::getInstance()->getThreadState();

编译器（GCC 4.4.5）给出了以下错误：

CanCommunicator::getInstance is ambiguous
Candidates are:
CanCommunicator * getInstance()
CanCommunicator * getInstance(std::shared_ptr<IsoTpThreadState>)

导致此错误的原因是什么？如何解决？ 实例创建需要重载方法，没有参数的方法用于纯实例检索。

编辑：根据请求更多代码示例。

#include <memory>
#include <stdint.h>
#include <linux/can.h>
#include <linux/can/raw.h>

using std::shared_ptr;

//================
// Class in question
//================

struct ThreadState {
    int32_t socketFd;
    uint32_t sendId;
};

class CanCommunicator {
    #define null NULL

    public: // +++ STATIC +++
        static CanCommunicator* getInstance(shared_ptr<ThreadState> state);
        static CanCommunicator* getInstance();
    public:
        shared_ptr<ThreadState> getThreadState() { return this->threadState; }
    protected:
        CanCommunicator(shared_ptr<ThreadState> state);
    private: // +++ STATIC +++
        static CanCommunicator* instance;
    private:
        shared_ptr<ThreadState> threadState;
};


/*
 +++++++++++++++++++++++++++++++++++++
 +++       STATIC VARIABLES        +++
 +++++++++++++++++++++++++++++++++++++
 */

CanCommunicator* CanCommunicator::instance = null;


/*
 +++++++++++++++++++++++++++++++++++++
 +++        STATIC METHODS         +++
 +++++++++++++++++++++++++++++++++++++
 */

CanCommunicator* CanCommunicator::getInstance(shared_ptr<ThreadState> state) {
    if (state == null && instance == null)
        throw "Cannot instantiate from nullptr!";

    return instance == null ? (instance = new CanCommunicator(state)) : instance;
}

CanCommunicator* CanCommunicator::getInstance() { return instance == null ? throw "No instance found!" : instance; }

CanCommunicator::CanCommunicator(shared_ptr<ThreadState> state) {
    this->threadState = state;        
}

//================
// Calling code
//================

int canSendData(int32_t skt, uint32_t sendCanId, const uint8_t* data, uint8_t dataLength, uint8_t extended) {
    struct can_frame myCanFrame;
    return (int)write(skt, &myCanFrame, sizeof(myCanFrame));
}

int isotp_user_send_can(const uint32_t arbitrationId, const uint8_t* data, const uint8_t size) {
    auto tState = CanCommunicator::getInstance()->getThreadState(); //<-------- Error originates here
    return canSendData(tState->socketFd, (int)tState->sendId, data, size, false) > 0 ? 0 : 1;
}

Answer 1

感谢Radoslaw的建议，我只是将违规函数重命名为getInstanceByState（）。

这似乎是我正在使用的GCC版本（4.4.5）中的一个错误，所以没有真正的修复，但要等到我可以使用（更多）更新的编译器版本。

感谢所有帮助过的人并给出了建议。