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Bug 1461

Summary: Map<const Quaterniond> compile error
Product: Eigen Reporter: Huang Qinjin <huangqinjin>
Component: GeometryAssignee: Nobody <eigen.nobody>
Severity: Unknown CC: chtz, gael.guennebaud, hauke.heibel, jacob.benoit.1
Priority: Normal    
Version: 3.3 (current stable)   
Hardware: x86 - 64-bit   
OS: Linux   

Description Huang Qinjin 2017-08-11 04:55:17 UTC
With g++ 5.4 and eigen 3.3.4 on ubuntu 16.04

    const double d[4] = {0, 0, 0, 1};

    Map<const Vector4d> v(d);
    double s = v.w();             // ok

    Map<const Quaterniond> q(d);
    double w = q.w();             // compile error

/usr/local/include/eigen3/Eigen/src/Geometry/Quaternion.h:76:84: error: binding ‘const Scalar {aka const double}’ to reference of type ‘Eigen::QuaternionBase<Eigen::Map<const Eigen::Quaternion<double> > >::Scalar& {aka double&}’ discards qualifiers
   EIGEN_DEVICE_FUNC inline Scalar& w() { return this->derived().coeffs().coeffRef(3); }
Comment 2 Nobody 2019-12-04 17:09:44 UTC
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