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Add support for C++11 result_of/lambdas

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This commit is contained in:
Gael Guennebaud 2015-02-19 15:18:37 +01:00
parent db05f2d01e
commit 829dddd0fd
2 changed files with 31 additions and 6 deletions
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5
Eigen/src/Core/util/Macros.h
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@ -382,6 +382,11 @@
#define EIGEN_HAVE_RVALUE_REFERENCES
#endif
// Does the compiler support result_of?
#if (__has_feature(cxx_lambdas) || (defined(__cplusplus) && __cplusplus >= 201103L))
#define EIGEN_HAS_STD_RESULT_OF 1
#endif
// Does the compiler support variadic templates?
#if __cplusplus > 199711L
#define EIGEN_HAS_VARIADIC_TEMPLATES 1

32
Eigen/src/Core/util/Meta.h
View File

@ -165,6 +165,7 @@ 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;};
@ -175,13 +176,22 @@ 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);
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);
static has_none testFunctor(...);
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
enum {FunctorType = sizeof(testFunctor(static_cast<Func*>(0)))};
@ -199,13 +209,23 @@ 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);
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);
static has_none testFunctor(...);
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)))};