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bug #1286: automatically detect the available prototypes of functors passed to CwiseNullaryExpr such that functors have only to implement the operators that matters among:

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operator()()
 operator()(i)
 operator()(i,j)
Linear access is also automatically detected based on the availability of operator()(i,j).
This commit is contained in:
Gael Guennebaud
2016-08-31 15:45:25 +02:00
parent efe2c225c9
commit 218c37beb4
7 changed files with 145 additions and 70 deletions
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43
Eigen/src/Core/util/Meta.h
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@@ -22,6 +22,16 @@
namespace Eigen {
typedef EIGEN_DEFAULT_DENSE_INDEX_TYPE DenseIndex;
/**
* \brief The Index type as used for the API.
* \details To change this, \c \#define the preprocessor symbol \c EIGEN_DEFAULT_DENSE_INDEX_TYPE.
* \sa \blank \ref TopicPreprocessorDirectives, StorageIndex.
*/
typedef EIGEN_DEFAULT_DENSE_INDEX_TYPE Index;
namespace internal {
/** \internal
@@ -371,6 +381,39 @@ struct has_ReturnType
enum { value = sizeof(testFunctor<T>(0)) == sizeof(yes) };
};
template<int> struct any_int {};
template<typename T> const T& return_ref();
struct meta_yes { char data[1]; };
struct meta_no { char data[2]; };
template <typename T>
struct has_nullary_operator
{
template <typename C> static meta_yes testFunctor(C const *,any_int< sizeof(return_ref<C>()()) > * = 0);
static meta_no testFunctor(...);
enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
};
template <typename T>
struct has_unary_operator
{
template <typename C> static meta_yes testFunctor(C const *,any_int< sizeof(return_ref<C>()(Index(0))) > * = 0);
static meta_no testFunctor(...);
enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
};
template <typename T>
struct has_binary_operator
{
template <typename C> static meta_yes testFunctor(C const *,any_int< sizeof(return_ref<C>()(Index(0),Index(0))) > * = 0);
static meta_no testFunctor(...);
enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
};
/** \internal In short, it computes int(sqrt(\a Y)) with \a Y an integer.
* Usage example: \code meta_sqrt<1023>::ret \endcode
*/

10
Eigen/src/Core/util/XprHelper.h
View File

@@ -24,16 +24,6 @@
namespace Eigen {
typedef EIGEN_DEFAULT_DENSE_INDEX_TYPE DenseIndex;
/**
* \brief The Index type as used for the API.
* \details To change this, \c \#define the preprocessor symbol \c EIGEN_DEFAULT_DENSE_INDEX_TYPE.
* \sa \blank \ref TopicPreprocessorDirectives, StorageIndex.
*/
typedef EIGEN_DEFAULT_DENSE_INDEX_TYPE Index;
namespace internal {
template<typename IndexDest, typename IndexSrc>