diff options
author | 2016-06-06 12:06:42 -0700 | |
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committer | 2016-06-06 12:06:42 -0700 | |
commit | 33f0340188eb309dfa3b16c0758a878c3ea114d9 (patch) | |
tree | 838c6095f42573bdfe831a1ade07908a76dbb47b /Eigen/src/Core/util | |
parent | df24f4a01d762b0ae7dee8a1a0c769c96e4da835 (diff) |
Implement result_of for the new ternary functors
Diffstat (limited to 'Eigen/src/Core/util')
-rw-r--r-- | Eigen/src/Core/util/Meta.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/Eigen/src/Core/util/Meta.h b/Eigen/src/Core/util/Meta.h index 7ecd59add..bd3a0aa5d 100644 --- a/Eigen/src/Core/util/Meta.h +++ b/Eigen/src/Core/util/Meta.h @@ -328,6 +328,30 @@ struct result_of<Func(ArgType0,ArgType1)> { enum {FunctorType = sizeof(testFunctor(static_cast<Func*>(0)))}; typedef typename binary_result_of_select<Func, ArgType0, ArgType1, FunctorType>::type type; }; + +template<typename Func, typename ArgType0, typename ArgType1, typename ArgType2, int SizeOf=sizeof(has_none)> +struct ternary_result_of_select {typedef typename internal::remove_all<ArgType0>::type type;}; + +template<typename Func, typename ArgType0, typename ArgType1, typename ArgType2> +struct ternary_result_of_select<Func, ArgType0, ArgType1, ArgType2, sizeof(has_std_result_type)> +{typedef typename Func::result_type type;}; + +template<typename Func, typename ArgType0, typename ArgType1, typename ArgType2> +struct ternary_result_of_select<Func, ArgType0, ArgType1, ArgType2, sizeof(has_tr1_result)> +{typedef typename Func::template result<Func(ArgType0,ArgType1,ArgType2)>::type type;}; + +template<typename Func, typename ArgType0, typename ArgType1, typename ArgType2> +struct result_of<Func(ArgType0,ArgType1,ArgType2)> { + 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,ArgType2)>::type const * = 0); + 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 ternary_result_of_select<Func, ArgType0, ArgType1, ArgType2, FunctorType>::type type; +}; #endif /** \internal In short, it computes int(sqrt(\a Y)) with \a Y an integer. |