Fix warning

src/xtd.core/include/xtd/comparison_operators.h

@@ -63,9 +63,10 @@ namespace xtd {
     /// * std::strong_ordering::greater : if lhs greater than rhs;
     /// * std::strong_ordering::equivalent : if lhs is equal to rhs.
     friend std::strong_ordering operator <=>(const type_t& lhs, const type_t& rhs) noexcept {
-      if (dynamic_cast<const type_t*>(&rhs) && lhs.compare_to(static_cast<const type_t&>(rhs)) < 0) return std::strong_ordering::less;
-      if (dynamic_cast<const type_t*>(&rhs) && lhs.compare_to(static_cast<const type_t&>(rhs)) > 0) return std::strong_ordering::greater;
-      if (dynamic_cast<const type_t*>(&rhs) && lhs.compare_to(static_cast<const type_t&>(rhs)) == 0) return std::strong_ordering::equivalent;
+      auto rhs_ptr = &rhs;
+      if (dynamic_cast<const type_t*>(rhs_ptr) && lhs.compare_to(static_cast<const type_t&>(rhs)) < 0) return std::strong_ordering::less;
+      if (dynamic_cast<const type_t*>(rhs_ptr) && lhs.compare_to(static_cast<const type_t&>(rhs)) > 0) return std::strong_ordering::greater;
+      if (dynamic_cast<const type_t*>(rhs_ptr) && lhs.compare_to(static_cast<const type_t&>(rhs)) == 0) return std::strong_ordering::equivalent;
       return std::strong_ordering::less;
     }
 #endif

src/xtd.core/include/xtd/istringable.h

@@ -31,7 +31,7 @@ namespace xtd {
     /// @}
 
     /// @cond
-    friend std::ostream& operator <<(std::ostream& os, const istringable& obj);
+    friend std::ostream& operator <<(std::ostream& os, const istringable& obj) noexcept;
     /// @endcond
   };
 }

src/xtd.core/src/xtd/hash_code.cpp

@@ -24,7 +24,7 @@ size hash_code::combine_iterator(size seed) noexcept {
 
 size hash_code::hash_combine(size seed, size value) noexcept {
   // https://stackoverflow.com/questions/35985960/c-why-is-boosthash-combine-the-best-way-to-combine-hash-values
-  return seed ^ value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+  return (seed ^ value) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
 }
 
 size hash_code::generate_uniqueness_seed() noexcept {

src/xtd.core/src/xtd/istringable.cpp

@@ -1,6 +1,6 @@
 #include "../../include/xtd/istringable.h"
 #include "../../include/xtd/string.h"
 
-std::ostream& xtd::operator <<(std::ostream& os, const xtd::istringable& obj) {
+std::ostream& operator <<(std::ostream& os, const xtd::istringable& obj) noexcept {
   return os << obj.to_string();
 }