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Make sure sizeof is truelly needed, thus improving SFINAE portability.

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This commit is contained in:
Gael Guennebaud 2016-08-31 23:40:18 +02:00
parent 84cf6e42ca
commit 836fa25a82
1 changed files with 4 additions and 4 deletions
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8
Eigen/src/Core/util/Meta.h
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@ -381,13 +381,13 @@ struct has_ReturnType
enum { value = sizeof(testFunctor<T>(0)) == sizeof(meta_yes) }; enum { value = sizeof(testFunctor<T>(0)) == sizeof(meta_yes) };
}; };
template<int Val> struct integral_constant { static const int value = Val; }; template<int Size> struct meta_array { int a[Size]; };
template<typename T> const T& return_ref(); template<typename T> const T& return_ref();
template <typename T> template <typename T>
struct has_nullary_operator struct has_nullary_operator
{ {
template <typename C> static meta_yes testFunctor(C const *,integral_constant< sizeof(return_ref<C>()()) > * = 0); template <typename C> static meta_yes testFunctor(C const *,meta_array< sizeof(return_ref<C>()()) > * = 0);
static meta_no testFunctor(...); static meta_no testFunctor(...);
enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) }; enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
@ -396,7 +396,7 @@ struct has_nullary_operator
template <typename T> template <typename T>
struct has_unary_operator struct has_unary_operator
{ {
template <typename C> static meta_yes testFunctor(C const *,integral_constant< sizeof(return_ref<C>()(Index(0))) > * = 0); template <typename C> static meta_yes testFunctor(C const *,meta_array< sizeof(return_ref<C>()(Index(0))) > * = 0);
static meta_no testFunctor(...); static meta_no testFunctor(...);
enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) }; enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };
@ -405,7 +405,7 @@ struct has_unary_operator
template <typename T> template <typename T>
struct has_binary_operator struct has_binary_operator
{ {
template <typename C> static meta_yes testFunctor(C const *,integral_constant< sizeof(return_ref<C>()(Index(0),Index(0))) > * = 0); template <typename C> static meta_yes testFunctor(C const *,meta_array< sizeof(return_ref<C>()(Index(0),Index(0))) > * = 0);
static meta_no testFunctor(...); static meta_no testFunctor(...);
enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) }; enum { value = sizeof(testFunctor(static_cast<T*>(0))) == sizeof(meta_yes) };