1 // This file is part of Eigen, a lightweight C++ template library 2 // for linear algebra. 3 // 4 // Copyright (C) 2015 Benoit Steiner <benoit.steiner.goog (at) gmail.com> 5 // 6 // This Source Code Form is subject to the terms of the Mozilla 7 // Public License v. 2.0. If a copy of the MPL was not distributed 8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 9 10 #ifndef EIGEN_CXX11_TENSOR_TENSOR_META_MACROS_H 11 #define EIGEN_CXX11_TENSOR_TENSOR_META_MACROS_H 12 13 14 /** use this macro in sfinae selection in templated functions 15 * 16 * template<typename T, 17 * typename std::enable_if< isBanana<T>::value , int >::type = 0 18 * > 19 * void foo(){} 20 * 21 * becomes => 22 * 23 * template<typename TopoType, 24 * SFINAE_ENABLE_IF( isBanana<T>::value ) 25 * > 26 * void foo(){} 27 */ 28 29 // SFINAE requires variadic templates 30 #ifndef __CUDACC__ 31 #if EIGEN_HAS_VARIADIC_TEMPLATES 32 // SFINAE doesn't work for gcc <= 4.7 33 #ifdef EIGEN_COMP_GNUC 34 #if EIGEN_GNUC_AT_LEAST(4,8) 35 #define EIGEN_HAS_SFINAE 36 #endif 37 #else 38 #define EIGEN_HAS_SFINAE 39 #endif 40 #endif 41 #endif 42 43 #define EIGEN_SFINAE_ENABLE_IF( __condition__ ) \ 44 typename internal::enable_if< ( __condition__ ) , int >::type = 0 45 46 47 #if EIGEN_HAS_CONSTEXPR 48 #define EIGEN_CONSTEXPR constexpr 49 #else 50 #define EIGEN_CONSTEXPR 51 #endif 52 53 54 #endif 55
