shebo
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i'm using VC++
which is performance wise ?
1 -
CDMatrix& CDMatrix:
perator -(CDMatrix& in)
{
for(int i=0;i < this->row ;i++)
{
for(int j=0;j < this->column ;j++)
{
tmp.MData[j]=MData[j]-in.MData[j];
}
}
return(tmp);
}
where tmp is a new object of the class CDMatrix
or
2-
void CDMatrix:perator-=(CDMatrix& IM){
for(int i=0;i < this->row ;i++)
{
for(int j=0;j < this->column ;j++)
{
this->MData[j]=this->MData[j]-IM.MData[j];
}
}
}
where the return value is *this
which is performance wise ?
1 -
CDMatrix& CDMatrix:
perator -(CDMatrix& in){
for(int i=0;i < this->row ;i++)
{
for(int j=0;j < this->column ;j++)
{
tmp.MData[j]=MData[j]-in.MData[j];
}
}
return(tmp);
}
where tmp is a new object of the class CDMatrix
or
2-
void CDMatrix:
perator-=(CDMatrix& IM){for(int i=0;i < this->row ;i++)
{
for(int j=0;j < this->column ;j++)
{
this->MData[j]=this->MData[j]-IM.MData[j];
}
}
}
where the return value is *this
