variables alteration in c++ - c++

Question

i got a ridiculous problem.
i have a class within inside an array member.i have a get method and a set method for the array.
the problem is that i call the set(to update) method to change the variables within the array and i see with the debugger that the variables do actually update.then when i call immediately the get method just after the set method i found the variables of the array been changed back to their ancient values.
here is the code approximately :
object.updatFunction();//sort of set method
//nothing in between
Type variable=object.getFunction();
added code:
void Cube::updtCornersNextToCentr()
{
int iHalfSide=m_SideSize/2;
int centerX(m_Center.x()),centerY(m_Center.y()),centerZ(m_Center.z());
m_CubeCornerVertices[0].setX(centerX-iHalfSide);
m_CubeCornerVertices[0].setY(centerY+iHalfSide);
m_CubeCornerVertices[0].setZ(centerZ-iHalfSide);
m_CubeCornerVertices[1].setX(centerX+iHalfSide);
m_CubeCornerVertices[1].setY(centerY+iHalfSide);
m_CubeCornerVertices[1].setZ(centerZ-iHalfSide);
//.......
m_CubeCornerVertices[7].setX(centerX+iHalfSide);
m_CubeCornerVertices[7].setY(centerY-iHalfSide);
m_CubeCornerVertices[7].setZ(centerZ+iHalfSide);
}
QVector3D * Cube::getCubeCornerVertices()const
{
static QVector3D temp[8];
for(int i=0;i<8;i++)
{
temp[i]=m_CubeCornerVertices[i];
}
return &temp[0];
}

Answer 1

The problem was really ridiculous, i didn’t want to let this post ambiguous.it’s a very beginner fault and it’s all about a missing « & » that caused me to update a copy.
Actually i did above simplify write the next code :
object.updatFunction();//sort of set method
//nothing in between
Type variable=object.getFunction();
And the more real code was something like:
m_WorldSpace->getCube().updtCornersNextToCentr()
//nothing in between
const QVector3D corners[8]=m_WorldSpace->getCube().getCubeCornerVertices();
all the problem was in the getCube() function which instead of being something like this :
Cube& WorldSpace::getCube()//here is the missing "&"
{
return m_Cube;
}
I wrote this
Cube WorldSpace::getCube()//this caused to get and update just a temporary copy
{
return m_Cube;
}
someone can say that i got multiple levels of getters which blinded me.
thank you.