From 6cbb3038ac48cb5fe17eba4dfbf26e3e798041f1 Mon Sep 17 00:00:00 2001
From: Steve Bronder <stevo15025@gmail.com>
Date: Thu, 4 Mar 2021 18:58:08 +0000
Subject: Adds EIGEN_CONSTEXPR and EIGEN_NOEXCEPT to rows(), cols(),
 innerStride(), outerStride(), and size()

---
 Eigen/src/Core/util/IndexedViewHelper.h | 12 +++---
 Eigen/src/Core/util/IntegralConstant.h  |  2 +-
 Eigen/src/Core/util/Meta.h              | 68 ++++++++++++++++-----------------
 Eigen/src/Core/util/SymbolicIndex.h     |  2 +-
 Eigen/src/Core/util/XprHelper.h         | 27 +++++++------
 5 files changed, 58 insertions(+), 53 deletions(-)

(limited to 'Eigen/src/Core/util')

diff --git a/Eigen/src/Core/util/IndexedViewHelper.h b/Eigen/src/Core/util/IndexedViewHelper.h
index 1cda85060..f85de305f 100644
--- a/Eigen/src/Core/util/IndexedViewHelper.h
+++ b/Eigen/src/Core/util/IndexedViewHelper.h
@@ -78,7 +78,7 @@ template<typename T, typename EnableIf = void> struct get_compile_time_incr {
 
 // Analogue of std::get<0>(x), but tailored for our needs.
 template<typename T>
-Index first(const T& x) { return x.first(); }
+EIGEN_CONSTEXPR Index first(const T& x) EIGEN_NOEXCEPT { return x.first(); }
 
 // IndexedViewCompatibleType/makeIndexedViewCompatible turn an arbitrary object of type T into something usable by MatrixSlice
 // The generic implementation is a no-op
@@ -100,8 +100,8 @@ struct SingleRange {
   };
   SingleRange(Index val) : m_value(val) {}
   Index operator[](Index) const { return m_value; }
-  Index size() const { return 1; }
-  Index first() const { return m_value; }
+  static EIGEN_CONSTEXPR Index size() EIGEN_NOEXCEPT { return 1; }
+  Index first() const EIGEN_NOEXCEPT { return m_value; }
   Index m_value;
 };
 
@@ -141,9 +141,9 @@ template<int XprSize>
 struct AllRange {
   enum { SizeAtCompileTime = XprSize };
   AllRange(Index size = XprSize) : m_size(size) {}
-  Index operator[](Index i) const { return i; }
-  Index size() const { return m_size.value(); }
-  Index first() const { return 0; }
+  EIGEN_CONSTEXPR Index operator[](Index i) const EIGEN_NOEXCEPT { return i; }
+  EIGEN_CONSTEXPR Index size() const EIGEN_NOEXCEPT { return m_size.value(); }
+  EIGEN_CONSTEXPR Index first() const EIGEN_NOEXCEPT { return 0; }
   variable_if_dynamic<Index,XprSize> m_size;
 };
 
diff --git a/Eigen/src/Core/util/IntegralConstant.h b/Eigen/src/Core/util/IntegralConstant.h
index caeea232d..ef3fdfb94 100644
--- a/Eigen/src/Core/util/IntegralConstant.h
+++ b/Eigen/src/Core/util/IntegralConstant.h
@@ -52,7 +52,7 @@ template<int N> class FixedInt
 {
 public:
   static const int value = N;
-  operator int() const { return value; }
+  EIGEN_CONSTEXPR operator int() const { return value; }
   FixedInt() {}
   FixedInt( VariableAndFixedInt<N> other) {
     #ifndef EIGEN_INTERNAL_DEBUGGING
diff --git a/Eigen/src/Core/util/Meta.h b/Eigen/src/Core/util/Meta.h
index cad57c3a4..85d35fc4e 100755
--- a/Eigen/src/Core/util/Meta.h
+++ b/Eigen/src/Core/util/Meta.h
@@ -286,7 +286,7 @@ namespace device {
 template<typename T> struct numeric_limits
 {
   EIGEN_DEVICE_FUNC
-  static T epsilon() { return 0; }
+  static EIGEN_CONSTEXPR T epsilon() { return 0; }
   static T (max)() { assert(false && "Highest not supported for this type"); }
   static T (min)() { assert(false && "Lowest not supported for this type"); }
   static T infinity() { assert(false && "Infinity not supported for this type"); }
@@ -294,9 +294,9 @@ template<typename T> struct numeric_limits
 };
 template<> struct numeric_limits<float>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static float epsilon() { return __FLT_EPSILON__; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static float (max)() {
   #if defined(EIGEN_CUDA_ARCH)
     return CUDART_MAX_NORMAL_F;
@@ -304,9 +304,9 @@ template<> struct numeric_limits<float>
     return HIPRT_MAX_NORMAL_F;
   #endif
   }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static float (min)() { return FLT_MIN; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static float infinity() {
   #if defined(EIGEN_CUDA_ARCH)
     return CUDART_INF_F;
@@ -314,7 +314,7 @@ template<> struct numeric_limits<float>
     return HIPRT_INF_F;
   #endif
   }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static float quiet_NaN() {
   #if defined(EIGEN_CUDA_ARCH)
     return CUDART_NAN_F;
@@ -325,13 +325,13 @@ template<> struct numeric_limits<float>
 };
 template<> struct numeric_limits<double>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static double epsilon() { return __DBL_EPSILON__; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static double (max)() { return DBL_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static double (min)() { return DBL_MIN; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static double infinity() {
   #if defined(EIGEN_CUDA_ARCH)
     return CUDART_INF;
@@ -339,7 +339,7 @@ template<> struct numeric_limits<double>
     return HIPRT_INF;
   #endif
   }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static double quiet_NaN() {
   #if defined(EIGEN_CUDA_ARCH)
     return CUDART_NAN;
@@ -350,65 +350,65 @@ template<> struct numeric_limits<double>
 };
 template<> struct numeric_limits<int>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static int epsilon() { return 0; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static int (max)() { return INT_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static int (min)() { return INT_MIN; }
 };
 template<> struct numeric_limits<unsigned int>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned int epsilon() { return 0; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned int (max)() { return UINT_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned int (min)() { return 0; }
 };
 template<> struct numeric_limits<long>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static long epsilon() { return 0; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static long (max)() { return LONG_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static long (min)() { return LONG_MIN; }
 };
 template<> struct numeric_limits<unsigned long>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned long epsilon() { return 0; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned long (max)() { return ULONG_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned long (min)() { return 0; }
 };
 template<> struct numeric_limits<long long>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static long long epsilon() { return 0; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static long long (max)() { return LLONG_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static long long (min)() { return LLONG_MIN; }
 };
 template<> struct numeric_limits<unsigned long long>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned long long epsilon() { return 0; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned long long (max)() { return ULLONG_MAX; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static unsigned long long (min)() { return 0; }
 };
 template<> struct numeric_limits<bool>
 {
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static bool epsilon() { return false; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR
   static bool (max)() { return true; }
-  EIGEN_DEVICE_FUNC
+  EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR 
   static bool (min)() { return false; }
 };
 
@@ -476,10 +476,10 @@ template<typename T, std::size_t N> struct array_size<std::array<T,N> > {
   *
   */
 template<typename T>
-Index size(const T& x) { return x.size(); }
+EIGEN_CONSTEXPR Index size(const T& x) { return x.size(); }
 
 template<typename T,std::size_t N>
-Index size(const T (&) [N]) { return N; }
+EIGEN_CONSTEXPR Index size(const T (&) [N]) { return N; }
 
 /** \internal
   * Convenient struct to get the result type of a nullary, unary, binary, or
diff --git a/Eigen/src/Core/util/SymbolicIndex.h b/Eigen/src/Core/util/SymbolicIndex.h
index 17cf46f05..354dd9add 100644
--- a/Eigen/src/Core/util/SymbolicIndex.h
+++ b/Eigen/src/Core/util/SymbolicIndex.h
@@ -65,7 +65,7 @@ class ValueExpr<internal::FixedInt<N> > {
 public:
   ValueExpr() {}
   template<typename T>
-  Index eval_impl(const T&) const { return N; }
+  EIGEN_CONSTEXPR Index eval_impl(const T&) const { return N; }
 };
 
 
diff --git a/Eigen/src/Core/util/XprHelper.h b/Eigen/src/Core/util/XprHelper.h
index f83bca15a..4ae86c45e 100644
--- a/Eigen/src/Core/util/XprHelper.h
+++ b/Eigen/src/Core/util/XprHelper.h
@@ -131,9 +131,12 @@ template<typename T, int Value> class variable_if_dynamic
   public:
     EIGEN_DEFAULT_EMPTY_CONSTRUCTOR_AND_DESTRUCTOR(variable_if_dynamic)
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit variable_if_dynamic(T v) { EIGEN_ONLY_USED_FOR_DEBUG(v); eigen_assert(v == T(Value)); }
-    EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE T value() { return T(Value); }
-    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE operator T() const { return T(Value); }
-    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void setValue(T) {}
+    EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE EIGEN_CONSTEXPR
+    T value() { return T(Value); }
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE EIGEN_CONSTEXPR
+    operator T() const { return T(Value); }
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE EIGEN_CONSTEXPR
+    void setValue(T) {}
 };
 
 template<typename T> class variable_if_dynamic<T, Dynamic>
@@ -154,8 +157,10 @@ template<typename T, int Value> class variable_if_dynamicindex
   public:
     EIGEN_EMPTY_STRUCT_CTOR(variable_if_dynamicindex)
     EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE explicit variable_if_dynamicindex(T v) { EIGEN_ONLY_USED_FOR_DEBUG(v); eigen_assert(v == T(Value)); }
-    EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE T value() { return T(Value); }
-    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE void setValue(T) {}
+    EIGEN_DEVICE_FUNC static EIGEN_STRONG_INLINE EIGEN_CONSTEXPR
+    T value() { return T(Value); }
+    EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE EIGEN_CONSTEXPR
+    void setValue(T) {}
 };
 
 template<typename T> class variable_if_dynamicindex<T, DynamicIndex>
@@ -428,7 +433,7 @@ struct ref_selector
     T const&,
     const T
   >::type type;
-  
+
   typedef typename conditional<
     bool(traits<T>::Flags & NestByRefBit),
     T &,
@@ -614,7 +619,7 @@ struct plain_row_type
   typedef typename conditional<
     is_same< typename traits<ExpressionType>::XprKind, MatrixXpr >::value,
     MatrixRowType,
-    ArrayRowType 
+    ArrayRowType
   >::type type;
 };
 
@@ -629,7 +634,7 @@ struct plain_col_type
   typedef typename conditional<
     is_same< typename traits<ExpressionType>::XprKind, MatrixXpr >::value,
     MatrixColType,
-    ArrayColType 
+    ArrayColType
   >::type type;
 };
 
@@ -645,7 +650,7 @@ struct plain_diag_type
   typedef typename conditional<
     is_same< typename traits<ExpressionType>::XprKind, MatrixXpr >::value,
     MatrixDiagType,
-    ArrayDiagType 
+    ArrayDiagType
   >::type type;
 };
 
@@ -761,7 +766,7 @@ std::string demangle_flags(int f)
   if(f&DirectAccessBit)             res += " | Direct";
   if(f&NestByRefBit)                res += " | NestByRef";
   if(f&NoPreferredStorageOrderBit)  res += " | NoPreferredStorageOrderBit";
-  
+
   return res;
 }
 #endif
@@ -858,7 +863,7 @@ struct ScalarBinaryOpTraits<void,void,BinaryOp>
 #define EIGEN_CHECK_BINARY_COMPATIBILIY(BINOP,LHS,RHS) \
   EIGEN_STATIC_ASSERT((Eigen::internal::has_ReturnType<ScalarBinaryOpTraits<LHS, RHS,BINOP> >::value), \
     YOU_MIXED_DIFFERENT_NUMERIC_TYPES__YOU_NEED_TO_USE_THE_CAST_METHOD_OF_MATRIXBASE_TO_CAST_NUMERIC_TYPES_EXPLICITLY)
-    
+
 } // end namespace Eigen
 
 #endif // EIGEN_XPRHELPER_H
-- 
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