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Make is_convertible more robust and conformant to std::is_convertible

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This commit is contained in:
Gael Guennebaud
2018-07-12 09:57:19 +02:00
parent 8a5955a052
commit 21cf4a1a8b
2 changed files with 36 additions and 12 deletions
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12
Eigen/src/Core/util/Meta.h
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@@ -145,16 +145,19 @@ private:
struct yes {int a[1];};
struct no {int a[2];};
static yes test(const To&, int);
template<typename T>
static yes test(T, int);
template<typename T>
static no test(any_conversion, ...);
public:
static From ms_from;
static From* ms_from;
#ifdef __INTEL_COMPILER
#pragma warning push
#pragma warning ( disable : 2259 )
#endif
enum { value = sizeof(test(ms_from, 0))==sizeof(yes) };
enum { value = sizeof(test<To>(*ms_from, 0))==sizeof(yes) };
#ifdef __INTEL_COMPILER
#pragma warning pop
#endif
@@ -163,8 +166,7 @@ public:
template<typename From, typename To>
struct is_convertible
{
enum { value = is_convertible_impl<typename remove_all<From>::type,
typename remove_all<To >::type>::value };
enum { value = is_convertible_impl<From,To>::value };
};
/** \internal Allows to enable/disable an overload