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bug #826: fix is_convertible for MSVC and add minimalistic unit test for is_convertible

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This commit is contained in:
Gael Guennebaud
2014-07-16 13:17:06 +02:00
parent 0a945687b7
commit 338d2ec42b
2 changed files with 40 additions and 7 deletions
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23
Eigen/src/Core/util/Meta.h
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@@ -82,22 +82,31 @@ template<typename T> struct add_const_on_value_type<T const* const> { typedef T
template<typename From, typename To>
struct is_convertible
struct is_convertible_impl
{
private:
struct any_conversion
{
template <typename T> any_conversion(const volatile T&);
template <typename T> any_conversion(T&);
};
struct yes {int a[1];};
struct no {int a[2];};
template<typename T>
static yes test (const T&) {}
template<typename> static no test (...) {}
static yes test(const To&, int);
static no test(any_conversion, ...);
public:
static From ms_from;
enum { value = sizeof(test<To>(ms_from))==sizeof(yes) };
enum { value = sizeof(test(ms_from, 0))==sizeof(yes) };
};
template<typename From, typename To>
struct is_convertible
{
enum { value = is_convertible_impl<typename remove_all<From>::type,
typename remove_all<To >::type>::value };
};
/** \internal Allows to enable/disable an overload
* according to a compile time condition.