Merge pull request #147 from steve-downey/LWG4072-constrain-compare

LWG4072. std::optional comparisons: constrain harder
See https://cplusplus.github.io/LWG/issue4072

Author: steve-downey

.clang-format

@@ -196,15 +196,15 @@ SpaceBeforeCpp11BracedList: false
 SpaceBeforeCtorInitializerColon: true
 SpaceBeforeInheritanceColon: true
 SpaceBeforeJsonColon: false
-SpaceBeforeParens: ControlStatements
+SpaceBeforeParens: Custom
 SpaceBeforeParensOptions:
   AfterControlStatements: true
   AfterForeachMacros: true
   AfterFunctionDefinitionName: false
   AfterFunctionDeclarationName: false
   AfterIfMacros:   true
   AfterOverloadedOperator: false
-  AfterRequiresInClause: false
+  AfterRequiresInClause: true
   AfterRequiresInExpression: false
   BeforeNonEmptyParentheses: false
 SpaceBeforeRangeBasedForLoopColon: true

include/beman/optional/detail/stl_interfaces/iterator_interface.hpp

@@ -435,15 +435,15 @@ BEMAN_OPTIONAL_DETAIL_STL_INTERFACES_NAMESPACE_V2 {
     };
 
     template <typename Iterator>
-        requires(
+        requires (
             !requires { typename std::iterator_traits<Iterator>::iterator_concept; } &&
             requires { typename std::iterator_traits<Iterator>::iterator_category; })
     struct iter_concept<Iterator> {
         using type = typename std::iterator_traits<Iterator>::iterator_category;
     };
 
     template <typename Iterator>
-        requires(
+        requires (
             !requires { typename std::iterator_traits<Iterator>::iterator_concept; } &&
             !requires { typename std::iterator_traits<Iterator>::iterator_category; })
     struct iter_concept<Iterator> {