diff --git a/.clang-tidy b/.clang-tidy
index e4dfeb10..484040d8 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -18,6 +18,7 @@ Checks: >-
   -google-readability-todo,
   -google-default-arguments,
   -google-explicit-constructor,
+  -google-build-using-namespace,
   -hicpp-signed-bitwise,
   -hicpp-explicit-conversions,
   -llvmlibc-*,
diff --git a/src/class_diagram/generators/plantuml/class_diagram_generator.cc b/src/class_diagram/generators/plantuml/class_diagram_generator.cc
index 0cdcce46..abd3b854 100644
--- a/src/class_diagram/generators/plantuml/class_diagram_generator.cc
+++ b/src/class_diagram/generators/plantuml/class_diagram_generator.cc
@@ -101,6 +101,8 @@ void generator::generate(const class_ &c, std::ostream &ostr) const
 {
     namespace plantuml_common = clanguml::common::generators::plantuml;
 
+    constexpr auto kAbbreviatedMethodArgumentsLength{15};
+
     const auto &uns = m_config.using_namespace();
 
     std::string class_type{"class"};
@@ -148,7 +150,8 @@ void generator::generate(const class_ &c, std::ostream &ostr) const
             auto args_string = fmt::format("{}", fmt::join(params, ", "));
             if (m_config.generate_method_arguments() ==
                 config::method_arguments::abbreviated) {
-                args_string = clanguml::util::abbreviate(args_string, 10);
+                args_string = clanguml::util::abbreviate(
+                    args_string, kAbbreviatedMethodArgumentsLength);
             }
             ostr << args_string;
         }
diff --git a/src/common/model/namespace.h b/src/common/model/namespace.h
index a591cda9..ab1c9d67 100644
--- a/src/common/model/namespace.h
+++ b/src/common/model/namespace.h
@@ -42,8 +42,8 @@ template <> struct hash<clanguml::common::model::namespace_> {
 
         std::size_t seed = key.size();
         for (const auto &ns : key) {
-            seed ^= std::hash<std::string>{}(ns) + 0x6a3712b5 + (seed << 6) +
-                (seed >> 2);
+            seed ^=
+                std::hash<std::string>{}(ns) + clanguml::util::hash_seed(seed);
         }
 
         return seed;
diff --git a/src/common/model/source_file.h b/src/common/model/source_file.h
index f3c96a9e..c0b7399f 100644
--- a/src/common/model/source_file.h
+++ b/src/common/model/source_file.h
@@ -131,8 +131,8 @@ template <> struct hash<clanguml::common::model::filesystem_path> {
 
         std::size_t seed = key.size();
         for (const auto &ns : key) {
-            seed ^= std::hash<std::string>{}(ns) + 0x6a3712b5 + (seed << 6) +
-                (seed >> 2);
+            seed ^=
+                std::hash<std::string>{}(ns) + clanguml::util::hash_seed(seed);
         }
 
         return seed;
diff --git a/src/main.cc b/src/main.cc
index aabfccb8..290bd1f8 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -403,11 +403,14 @@ bool ensure_output_directory_exists(const std::string &dir)
 
 void print_version()
 {
+    constexpr auto kLLVMBackendPackageStringLength{5};
     std::cout << "clang-uml " << clanguml::version::CLANG_UML_VERSION << '\n';
     std::cout << "Copyright (C) 2021-2022 Bartek Kryza <bkryza@gmail.com>"
               << '\n';
     std::cout << "Built with LLVM version: "
-              << std::string{BACKEND_PACKAGE_STRING}.substr(5) << std::endl;
+              << std::string{BACKEND_PACKAGE_STRING}.substr(
+                     kLLVMBackendPackageStringLength)
+              << std::endl;
     std::cout << "Using LLVM version: " << clang::getClangFullVersion()
               << std::endl;
 }
diff --git a/src/sequence_diagram/model/participant.cc b/src/sequence_diagram/model/participant.cc
index 3d103d45..959e4b22 100644
--- a/src/sequence_diagram/model/participant.cc
+++ b/src/sequence_diagram/model/participant.cc
@@ -193,13 +193,16 @@ std::string function::full_name_no_ns() const
 
 std::string function::message_name(message_render_mode mode) const
 {
+    constexpr auto kAbbreviatedMethodArgumentsLength{15};
+
     if (mode == message_render_mode::no_arguments) {
         return fmt::format("{}(){}", name(), is_const() ? " const" : "");
     }
     else if (mode == message_render_mode::abbreviated) {
         return fmt::format("{}({}){}", name(),
             clanguml::util::abbreviate(
-                fmt::format("{}", fmt::join(parameters_, ",")), 15),
+                fmt::format("{}", fmt::join(parameters_, ",")),
+                kAbbreviatedMethodArgumentsLength),
             is_const() ? " const" : "");
     }
 
@@ -259,6 +262,8 @@ std::string method::full_name(bool /*relative*/) const
 
 std::string method::message_name(message_render_mode mode) const
 {
+    constexpr auto kAbbreviatedMethodArgumentsLength{15};
+
     const std::string style = is_static() ? "__" : "";
 
     if (mode == message_render_mode::no_arguments) {
@@ -268,7 +273,8 @@ std::string method::message_name(message_render_mode mode) const
     else if (mode == message_render_mode::abbreviated) {
         return fmt::format("{}({}){}", name(),
             clanguml::util::abbreviate(
-                fmt::format("{}", fmt::join(parameters(), ",")), 15),
+                fmt::format("{}", fmt::join(parameters(), ",")),
+                kAbbreviatedMethodArgumentsLength),
             is_const() ? " const" : "");
     }
 
@@ -334,6 +340,8 @@ std::string function_template::full_name_no_ns() const
 
 std::string function_template::message_name(message_render_mode mode) const
 {
+    constexpr auto kAbbreviatedMethodArgumentsLength{15};
+
     std::ostringstream s;
     render_template_params(s, using_namespace(), true);
     std::string template_params = s.str();
@@ -345,7 +353,8 @@ std::string function_template::message_name(message_render_mode mode) const
     else if (mode == message_render_mode::abbreviated) {
         return fmt::format("{}({}){}", name(),
             clanguml::util::abbreviate(
-                fmt::format("{}", fmt::join(parameters(), ",")), 15),
+                fmt::format("{}", fmt::join(parameters(), ",")),
+                kAbbreviatedMethodArgumentsLength),
             is_const() ? " const" : "");
     }
 
diff --git a/src/util/util.cc b/src/util/util.cc
index ace86166..ac5105ba 100644
--- a/src/util/util.cc
+++ b/src/util/util.cc
@@ -281,4 +281,13 @@ template <> bool ends_with(const std::string &value, const std::string &suffix)
     return std::equal(suffix.rbegin(), suffix.rend(), value.rbegin());
 }
 
+std::size_t hash_seed(std::size_t seed)
+{
+    constexpr auto kSeedStart{0x6a3712b5};
+    constexpr auto kSeedShiftFirst{6};
+    constexpr auto kSeedShiftSecond{2};
+
+    return kSeedStart + (seed << kSeedShiftFirst) + (seed >> kSeedShiftSecond);
+}
+
 } // namespace clanguml::util
diff --git a/src/util/util.h b/src/util/util.h
index ad10816f..599ee3a6 100644
--- a/src/util/util.h
+++ b/src/util/util.h
@@ -27,8 +27,7 @@
 #include <type_traits>
 #include <vector>
 
-namespace clanguml {
-namespace util {
+namespace clanguml::util {
 
 std::string ltrim(const std::string &s);
 std::string rtrim(const std::string &s);
@@ -247,5 +246,6 @@ void for_each_if(const T &collection, C &&cond, F &&func)
         });
 }
 
-} // namespace util
-} // namespace clanguml
\ No newline at end of file
+std::size_t hash_seed(std::size_t seed);
+
+} // namespace clanguml::util
\ No newline at end of file