devtools/eigen
1
0
Fork 0
mirror of https://gitlab.com/libeigen/eigen.git synced 2026-04-10 11:34:33 +08:00
Code Issues Packages Projects Releases Wiki Activity

Introduced NestParentByRefBit and NestByRefBit - this should fix temporaries related to nested products.

Browse Source 
Fixed a few typos and a few warnings.
This commit is contained in:
Hauke Heibel
2010-02-06 17:43:32 +01:00
parent 6f3f857897
commit 871698d3aa
29 changed files with 84 additions and 75 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
Eigen/src/Core/util/XprHelper.h
View File

@@ -97,7 +97,7 @@ class ei_compute_matrix_flags
};
public:
enum { ret = LinearAccessBit | DirectAccessBit | packet_access_bit | row_major_bit | aligned_bit };
enum { ret = LinearAccessBit | DirectAccessBit | NestByRefBit | packet_access_bit | row_major_bit | aligned_bit };
};
template<int _Rows, int _Cols> struct ei_size_at_compile_time
@@ -201,6 +201,28 @@ template<typename T> struct ei_plain_matrix_type_row_major
// we should be able to get rid of this one too
template<typename T> struct ei_must_nest_by_value { enum { ret = false }; };
template<class T>
struct ei_is_reference
{
#ifndef NDEBUG
static void check() { std::cout << typeid(T).name() << std::endl; }
#else
static void check() {}
#endif
enum { ret = false };
};
template<class T>
struct ei_is_reference<T&>
{
#ifndef NDEBUG
static void check() { std::cout << typeid(T).name() << "&" << std::endl; }
#else
static void check() {}
#endif
enum { ret = true };
};
/**
* The reference selector for template expressions. The idea is that we don't
* need to use references for expressions since they are light weight proxy
@@ -209,31 +231,14 @@ template<typename T> struct ei_must_nest_by_value { enum { ret = false }; };
template <typename T>
struct ei_ref_selector
{
typedef T type;
typedef typename ei_meta_if<
bool(ei_traits<T>::Flags & NestByRefBit),
T const&,
T
>::ret type;
};
/**
* Matrices on the other hand side should only be copied, when it is sure
* we gain by copying (see arithmetic cost check and eval before nesting flag).
* Note: This is an optimization measure that comprises potential (though little)
* to create erroneous code. Any user, utilizing ei_nested outside of
* Eigen needs to take care that no references to temporaries are
* stored or that this potential danger is at least communicated
* to the user.
**/
template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
struct ei_ref_selector< Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> >
{
typedef Matrix<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> MatrixType;
typedef MatrixType const& type;
};
template<typename _Scalar, int _Rows, int _Cols, int _Options, int _MaxRows, int _MaxCols>
struct ei_ref_selector< Array<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> >
{
typedef Array<_Scalar, _Rows, _Cols, _Options, _MaxRows, _MaxCols> ArrayType;
typedef ArrayType const& type;
};
#define EIGEN_PROPAGATE_NESTING_BIT(ReferenceFlags) ((ReferenceFlags) & NestParentByRefBit)<<1
/** \internal Determines how a given expression should be nested into another one.
* For example, when you do a * (b+c), Eigen will determine how the expression b+c should be