float与0比较

代码，运行结果

        if (mSetting)
            mpLocalMapper->mThFarPoints = mSetting->thFarPoints();
        else
            mpLocalMapper->mThFarPoints = fsSettings["thFarPoints"];
        // ? 这里有个疑问,C++中浮点型跟0比较是否用精确?
        if (mpLocalMapper->mThFarPoints != 0) {
    
            cout << "Discard points further than " << mpLocalMapper->mThFarPoints << " m from current camera" << endl;
            mpLocalMapper->mbFarPoints = true;
        } else{
    
            mpLocalMapper->mbFarPoints = false;
            cout << "Compare points further than " << mpLocalMapper->mThFarPoints << " m from current camera" << endl;
        }

结果

Compare points further than 0 m from current camera