[ox/std] Add std::string(_view) variant of MaybeView

deps/ox/src/ox/std/maybeview.hpp

@@ -8,7 +8,10 @@
 
 #pragma once
 
-#include "typetraits.hpp"
+#if __has_include(<string>)
+#include <string>
+#include <string_view>
+#endif
 
 namespace ox {
 
@@ -23,4 +26,11 @@ struct MaybeView {
 template<typename T>
 using MaybeView_t = typename MaybeView<T>::type;
 
+#if __has_include(<string>)
+template<typename CharT, typename Traits, typename Allocator>
+struct MaybeView<std::basic_string<CharT, Traits, Allocator>> {
+	using type = std::basic_string_view<CharT, Traits>;
+};
+#endif
+
 }