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Matrix::conservativeResize, resize only when necessary.

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This commit is contained in:
Hauke Heibel 2009-09-25 14:44:48 +02:00
parent 04dc63776a
commit 21d2533723
1 changed files with 4 additions and 0 deletions
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4
Eigen/src/Core/Matrix.h
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@ -707,6 +707,8 @@ struct ei_conservative_resize_like_impl
{
static void run(MatrixBase<Derived>& _this, const MatrixBase<OtherDerived>& other)
{
if (_this.rows() == other.rows() && _this.cols() == other.cols()) return;
// Note: Here is space for improvement. Basically, for conservativeResize(int,int),
// neither RowsAtCompileTime or ColsAtCompileTime must be Dynamic. If only one of the
// dimensions is dynamic, one could use either conservativeResize(int rows, NoChange_t) or
@ -728,6 +730,8 @@ struct ei_conservative_resize_like_impl<Derived,OtherDerived,true>
{
static void run(MatrixBase<Derived>& _this, const MatrixBase<OtherDerived>& other)
{
if (_this.rows() == other.rows() && _this.cols() == other.cols()) return;
// segment(...) will check whether Derived/OtherDerived are vectors!
typename MatrixBase<Derived>::PlainMatrixType tmp(other);
const int common_size = std::min<int>(_this.size(),tmp.size());