const references and function templates

P0959.md

@@ -86,6 +86,7 @@ Based on this feedback the following changes have been done in this version:
 * removed `to_wstring()` and made `to_string()` a function template
 * made `from_string()` a non-throwing function template returning `std::optional<std::uuid>`
 * added `is_valid_uuid()` a non-throwing function template that checks if a string contains a valid uuid
+* removed the `std::wstring` overloaded call operator for `uuid_name_generator` and replaced with with function templates
 * `uuid`s produced from names in different character sets or encodings are different (i.e. "jane" and L"jane")
 * removed the class `uuid_error`
 * footnote on the use of the name Microsoft
@@ -529,8 +530,13 @@ namespace std {
    public:
      explicit uuid_name_generator(uuid const& namespace_uuid) noexcept;
      
-     uuid operator()(std::string_view name);
+     template<class CharT = char>
-     uuid operator()(std::wstring_view name);
+     uuid operator()(CharT const * name);
+     
+     template<class CharT = char,
+              class Traits = std::char_traits<CharT>,
+              class Allocator = std::allocator<CharT>>
+     uuid operator()(std::basic_string<CharT, Traits, Allocator> const & name);
    };
 }
 ```

include/uuid.h

@@ -410,7 +410,7 @@ namespace uuids
       template<class CharT = char,
          class Traits = std::char_traits<CharT>,
          class Allocator = std::allocator<CharT>>
-      static bool is_valid_uuid(std::basic_string<CharT, Traits, Allocator>& str) noexcept
+      static bool is_valid_uuid(std::basic_string<CharT, Traits, Allocator> const & str) noexcept
       {
          return is_valid_uuid(str.c_str());
       }
@@ -469,7 +469,7 @@ namespace uuids
       template<class CharT = char, 
                class Traits = std::char_traits<CharT>,
                class Allocator = std::allocator<CharT>>
-      static std::optional<uuid> from_string(std::basic_string<CharT, Traits, Allocator>& str) noexcept
+      static std::optional<uuid> from_string(std::basic_string<CharT, Traits, Allocator> const & str) noexcept
       {
          return from_string(str.c_str());
       }
@@ -677,14 +677,24 @@ namespace uuids
          : nsuuid(namespace_uuid)
       {}
 
-      uuid operator()(std::string_view name)
+      template<class CharT = char>
+      uuid operator()(CharT const * name)
       {
+         size_t size = 0;
+         if constexpr (std::is_same_v<CharT, char>)
+            size = strlen(name);
+         else
+            size = wcslen(name);
+
          reset();
-         process_characters(name.data(), name.size());
+         process_characters(name, size);
          return make_uuid();
       }
 
-      uuid operator()(std::wstring_view name)
+      template<class CharT = char,
+         class Traits = std::char_traits<CharT>,
+         class Allocator = std::allocator<CharT>>
+      uuid operator()(std::basic_string<CharT, Traits, Allocator> const & name)
       {
          reset();
          process_characters(name.data(), name.size());
@@ -739,7 +749,7 @@ namespace uuids
    private:
       uuid nsuuid;
       detail::sha1 hasher;
-   }; 
+   };
 }
 
 namespace std

test/test_generators.cpp

@@ -154,7 +154,7 @@ TEST_CASE("Test basic random generator (conversion ctor w/ ref) w/ ranlux48_base
    REQUIRE(id1 != id2);
 }
 
-TEST_CASE("Test name generator", "[gen][name]")
+TEST_CASE("Test name generator (char*)", "[gen][name]")
 {
    uuids::uuid_name_generator dgen(uuids::uuid::from_string("47183823-2574-4bfd-b411-99ed177d3e43").value());
    auto id1 = dgen("john");
@@ -181,3 +181,33 @@ TEST_CASE("Test name generator", "[gen][name]")
    REQUIRE(id2 == id3);
    REQUIRE(id3 != id4);
 }
+
+TEST_CASE("Test name generator (std::string)", "[gen][name]")
+{
+   using namespace std::string_literals;
+
+   uuids::uuid_name_generator dgen(uuids::uuid::from_string("47183823-2574-4bfd-b411-99ed177d3e43").value());
+   auto id1 = dgen("john"s);
+   REQUIRE(!id1.is_nil());
+   REQUIRE(id1.version() == uuids::uuid_version::name_based_sha1);
+   REQUIRE(id1.variant() == uuids::uuid_variant::rfc);
+
+   auto id2 = dgen("jane"s);
+   REQUIRE(!id2.is_nil());
+   REQUIRE(id2.version() == uuids::uuid_version::name_based_sha1);
+   REQUIRE(id2.variant() == uuids::uuid_variant::rfc);
+
+   auto id3 = dgen("jane"s);
+   REQUIRE(!id3.is_nil());
+   REQUIRE(id3.version() == uuids::uuid_version::name_based_sha1);
+   REQUIRE(id3.variant() == uuids::uuid_variant::rfc);
+
+   auto id4 = dgen(L"jane"s);
+   REQUIRE(!id4.is_nil());
+   REQUIRE(id4.version() == uuids::uuid_version::name_based_sha1);
+   REQUIRE(id4.variant() == uuids::uuid_variant::rfc);
+
+   REQUIRE(id1 != id2);
+   REQUIRE(id2 == id3);
+   REQUIRE(id3 != id4);
+}