The "this" pointer cannot be converted from "const vector3d" to "vector3d &" error

The "this" pointer cannot be converted from "const vector3d" to "vector3d &" error

I compile the vector3d class in vs2005.
Error c2662: "vector3d: dotp": the "This" pointer cannot be converted from "const vector3d" to "vector3d &"

How can we correct it? This class is also written by others, and there is no compilation error.

# Pragma once

# Define m_pi 3.141
# Include <math. h>

Class vector3d {
Vector3d () {x = y = z = 0.0 ;}
Vector3d (double VX, double Vy, double vz= 0.0 ){
X = VX;
Y = Vy;
Z = VZ;
}
 
Double magnitude () const {
Return SQRT (x * x + y * Y + z * z );
}

Double dotp (const vector3d & V1, const vector3d & V2 ){
Return (v1.x * v2.x + v1.y * v2.y + v1.z * v2.z );
}

// Get the vector angle
Double angle () const {
Double ret = 0.0;
Double M = magn.pdf ();

If (M> 1.0e-6 ){

// The problem lies here !!!!
// ====================================
Double dp = dotp (* This, vector3d (1.0, 0.0 ));
// ====================================

If (DP/m> = 1.0 ){
Ret = 0.0;
}
Else if (DP/m <-1.0 ){
Ret = m_pi;
}
Else {
Ret = ACOs (DP/M );
}
If (Y <0.0 ){
Ret = 2 * m_pi-ret;
}
}
Return ret;
}

Protected:
Double X;
Double Y;
Double Z;

}; # Pragma once

# Define m_pi 3.141
# Include <math. h>

Class vector3d {
Vector3d () {x = y = z = 0.0 ;}
Vector3d (double VX, double Vy, double vz= 0.0 ){
X = VX;
Y = Vy;
Z = VZ;
}
 
Double magnitude () const {
Return SQRT (x * x + y * Y + z * z );
}

Double dotp (const vector3d & V1, const vector3d & V2 ){
Return (v1.x * v2.x + v1.y * v2.y + v1.z * v2.z );
}

// Get the vector angle
Double angle () const {
Double ret = 0.0;
Double M = magn.pdf ();

If (M> 1.0e-6 ){
Double dp = dotp (* This, vector3d (1.0, 0.0 ));

If (DP/m> = 1.0 ){
Ret = 0.0;
}
Else if (DP/m <-1.0 ){
Ret = m_pi;
}
Else {
Ret = ACOs (DP/M );
}
If (Y <0.0 ){
Ret = 2 * m_pi-ret;
}
}
Return ret;
}

Protected:
Double X;
Double Y;
Double Z;

};

Posted on beginning to programming read (791) Comments (2) EDIT collection reference category: key code

Comment

# Re: the "this" pointer cannot be converted from "const vector3d" to "vector3d &" error



Shi chuanhong

The reason is not that * This cannot be converted to const vector3d &, but the constant member function (double angle () const) cannot call non-
Common member functions (double dotp (const vector3d & V1, const vector3d &
V2). If you change dotp to the following definition: Double dotp (const vector3d & V1, const
Vector3d & V2) Const.

The problem is solved. Reply to more comments

# Re: the "this" pointer cannot be converted from "const vector3d" to "vector3d &" error



Nico

Double dotp (const vector3d & V1, const vector3d & V2) const

{

Return (v1.x * v2.x + v1.y * v2.y + v1.z * v2.z );

}

Reply to more comments