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much better workaround for empty struct (the previous one caused GCC 4.3 to generate wrong code leading to segfaults)

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This commit is contained in:
Gael Guennebaud
2009-12-18 17:08:59 +01:00
parent 945cbc3bc6
commit 9d54783036
5 changed files with 53 additions and 34 deletions
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17
Eigen/src/Core/util/XprHelper.h
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@@ -28,16 +28,11 @@
// just a workaround because GCC seems to not really like empty structs
#ifdef __GNUG__
struct ei_empty_struct
{
EIGEN_ALWAYS_INLINE_ATTRIB ei_empty_struct() {}
EIGEN_ALWAYS_INLINE_ATTRIB ei_empty_struct(const ei_empty_struct&) {}
EIGEN_ALWAYS_INLINE_ATTRIB ei_empty_struct& operator=(const ei_empty_struct&) { return *this; }
char _ei_dummy_;
};
#define EIGEN_EMPTY_STRUCT : Eigen::ei_empty_struct
#define EIGEN_EMPTY_STRUCT_CTOR(X) \
EIGEN_STRONG_INLINE X() {} \
EIGEN_STRONG_INLINE X(const X&) {}
#else
#define EIGEN_EMPTY_STRUCT
#define EIGEN_EMPTY_STRUCT_CTOR(X)
#endif
//classes inheriting ei_no_assignment_operator don't generate a default operator=.
@@ -51,10 +46,10 @@ class ei_no_assignment_operator
* can be accessed using value() and setValue().
* Otherwise, this class is an empty structure and value() just returns the template parameter Value.
*/
template<int Value> class ei_int_if_dynamic EIGEN_EMPTY_STRUCT
template<int Value> class ei_int_if_dynamic
{
public:
ei_int_if_dynamic() {}
EIGEN_EMPTY_STRUCT_CTOR(ei_int_if_dynamic)
explicit ei_int_if_dynamic(int) {}
static int value() { return Value; }
void setValue(int) {}