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Fix regression with C++11 support of lambda: now internal::result_of falls back to std::result_of in C++11.

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This commit is contained in:
Gael Guennebaud 2015-02-19 23:32:12 +01:00
parent ece6b440f9
commit a66f5fc2fd
1 changed files with 8 additions and 21 deletions
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29
Eigen/src/Core/util/Meta.h
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@ -160,12 +160,17 @@ protected:
* upcoming next STL generation (using a templated result member).
* If none of these members is provided, then the type of the first argument is returned. FIXME, that behavior is a pretty bad hack.
*/
template<typename T> struct result_of {};
#ifdef EIGEN_HAS_STD_RESULT_OF
template<typename T> struct result_of {
typedef typename std::result_of<T>::type type1;
typedef typename remove_all<type1>::type type;
};
#else
template<typename T> struct result_of { };
struct has_none {int a[1];};
struct has_std_result_type {int a[2];};
struct has_tr1_result {int a[3];};
struct has_cxx_eleven_result {int a[4];};
template<typename Func, typename ArgType, int SizeOf=sizeof(has_none)>
struct unary_result_of_select {typedef ArgType type;};
@ -176,21 +181,12 @@ struct unary_result_of_select<Func, ArgType, sizeof(has_std_result_type)> {typed
template<typename Func, typename ArgType>
struct unary_result_of_select<Func, ArgType, sizeof(has_tr1_result)> {typedef typename Func::template result<Func(ArgType)>::type type;};
#ifdef EIGEN_HAS_STD_RESULT_OF
template<typename Func, typename ArgType>
struct unary_result_of_select<Func, ArgType, sizeof(has_cxx_eleven_result)> {typedef typename std::result_of<Func(ArgType)>::type type;};
#endif
template<typename Func, typename ArgType>
struct result_of<Func(ArgType)> {
template<typename T>
static has_std_result_type testFunctor(T const *, typename T::result_type const * = 0);
template<typename T>
static has_tr1_result testFunctor(T const *, typename T::template result<T(ArgType)>::type const * = 0);
#ifdef EIGEN_HAS_STD_RESULT_OF
template<typename T>
static has_cxx_eleven_result testFunctor(T const *, typename std::result_of<T(ArgType)>::type const * = 0);
#endif
static has_none testFunctor(...);
// note that the following indirection is needed for gcc-3.3
@ -209,28 +205,19 @@ template<typename Func, typename ArgType0, typename ArgType1>
struct binary_result_of_select<Func, ArgType0, ArgType1, sizeof(has_tr1_result)>
{typedef typename Func::template result<Func(ArgType0,ArgType1)>::type type;};
#ifdef EIGEN_HAS_STD_RESULT_OF
template<typename Func, typename ArgType0, typename ArgType1>
struct binary_result_of_select<Func, ArgType0, ArgType1, sizeof(has_cxx_eleven_result)>
{typedef typename std::result_of<Func(ArgType0, ArgType1)>::type type;};
#endif
template<typename Func, typename ArgType0, typename ArgType1>
struct result_of<Func(ArgType0,ArgType1)> {
template<typename T>
static has_std_result_type testFunctor(T const *, typename T::result_type const * = 0);
template<typename T>
static has_tr1_result testFunctor(T const *, typename T::template result<T(ArgType0,ArgType1)>::type const * = 0);
#ifdef EIGEN_HAS_STD_RESULT_OF
template<typename T>
static has_cxx_eleven_result testFunctor(T const *, typename std::result_of<T(ArgType0, ArgType1)>::type const * = 0);
#endif
static has_none testFunctor(...);
// note that the following indirection is needed for gcc-3.3
enum {FunctorType = sizeof(testFunctor(static_cast<Func*>(0)))};
typedef typename binary_result_of_select<Func, ArgType0, ArgType1, FunctorType>::type type;
};
#endif
/** \internal In short, it computes int(sqrt(\a Y)) with \a Y an integer.
* Usage example: \code meta_sqrt<1023>::ret \endcode