Question

我正在尝试编译C ++代码，下面是代码段，我在此代码段下面添加了错误。

// Move constructor
    CLM(const CLM&& other)
    {
        this->detection_success = other.detection_success;
        this->tracking_initialised = other.tracking_initialised;
        this->detection_certainty = other.detection_certainty;
        this->model_likelihood = other.model_likelihood;
        this->failures_in_a_row = other.failures_in_a_row;

        pdm = other.pdm;
        params_local = other.params_local;
        params_global = other.params_global;
        detected_landmarks = other.detected_landmarks;
        landmark_likelihoods = other.landmark_likelihoods;
        patch_experts = other.patch_experts;
        landmark_validator = other.landmark_validator;


        triangulations = other.triangulations;
        kde_resp_precalc = other.kde_resp_precalc;
    }

    // Assignment operator for rvalues
    CLM & operator= (const CLM&& other)
    {
        this->detection_success = other.detection_success;
        this->tracking_initialised = other.tracking_initialised;
        this->detection_certainty = other.detection_certainty;
        this->model_likelihood = other.model_likelihood;
        this->failures_in_a_row = other.failures_in_a_row;

        pdm = other.pdm;
        params_local = other.params_local;
        params_global = other.params_global;
        detected_landmarks = other.detected_landmarks;
        landmark_likelihoods = other.landmark_likelihoods;
        patch_experts = other.patch_experts;
        landmark_validator = other.landmark_validator;


        triangulations = other.triangulations;
        kde_resp_precalc = other.kde_resp_precalc;
        return *this;
    }

我收到以下错误：

In file included from ../../Demo/Pack/CLM/include/CLM_utils.h:9:0,
                 from ../../Demo/Pack/CLM/src/CCNF_patch_expert.cpp:3:
../../Demo/Pack/CLM/include/CLM.h:170:16: error: expected ‘,’ or ‘...’ before ‘&&’ token
   CLM(const CLM&& other)
                ^
../../Demo/Pack/CLM/include/CLM.h:170:24: error: invalid constructor; you probably meant ‘CLMTracker::CLM (const CLMTracker::CLM&)’
   CLM(const CLM&& other)
                        ^
../../Demo/Pack/CLM/include/CLM.h:192:28: error: expected ‘,’ or ‘...’ before ‘&&’ token
  CLM & operator= (const CLM&& other)
                            ^
../../Demo/Pack/CLM/include/CLM.h: In member function ‘CLMTracker::CLM& CLMTracker::CLM::operator=(CLMTracker::CLM)’:
../../Demo/Pack/CLM/include/CLM.h:194:29: error: ‘other’ was not declared in this scope
   this->detection_success = other.detection_success;

我不知道代码有什么问题以及错误意味着什么？请有人帮忙。

Answer 1

const CLM&& other是 r值参考。这些是C ++ 11标准中对C ++的新增功能。将-std=c++11（或-std=c++0x（如果您使用的是较旧的编译器，请查看文档）添加到编译器调用中。

Answer 2

您使用的&&是rvalue reference，它只在c++11中有意义。因此，您应该告诉编译器您正在使用c++11。在GCC中，您可以通过传递-std=c++11

来实现

C ++中的构造函数错误无效

2 个答案: