Use Strings::EMPTY

toolsrc/src/SourceParagraph.cpp

@@ -187,7 +187,7 @@ namespace vcpkg
     {
         return Util::fmap(depends, [&](const std::string& depend_string) -> Dependency {
             auto pos = depend_string.find(' ');
-            if (pos == std::string::npos) return Dependency::parse_dependency(depend_string, "");
+            if (pos == std::string::npos) return Dependency::parse_dependency(depend_string, Strings::EMPTY);
             // expect of the form "\w+ \[\w+\]"
             Dependency dep;
 
@@ -195,7 +195,7 @@ namespace vcpkg
             if (depend_string.c_str()[pos + 1] != '(' || depend_string[depend_string.size() - 1] != ')')
             {
                 // Error, but for now just slurp the entire string.
-                return Dependency::parse_dependency(depend_string, "");
+                return Dependency::parse_dependency(depend_string, Strings::EMPTY);
             }
             dep.qualifier = depend_string.substr(pos + 2, depend_string.size() - pos - 3);
             return dep;

toolsrc/src/VcpkgCmdArguments.cpp

@@ -222,17 +222,17 @@ namespace vcpkg
 
     void VcpkgCmdArguments::check_max_arg_count(const size_t expected_arg_count) const
     {
-        return check_max_arg_count(expected_arg_count, "");
+        return check_max_arg_count(expected_arg_count, Strings::EMPTY);
     }
 
     void VcpkgCmdArguments::check_min_arg_count(const size_t expected_arg_count) const
     {
-        return check_min_arg_count(expected_arg_count, "");
+        return check_min_arg_count(expected_arg_count, Strings::EMPTY);
     }
 
     void VcpkgCmdArguments::check_exact_arg_count(const size_t expected_arg_count) const
     {
-        return check_exact_arg_count(expected_arg_count, "");
+        return check_exact_arg_count(expected_arg_count, Strings::EMPTY);
     }
 
     void VcpkgCmdArguments::check_max_arg_count(const size_t expected_arg_count, const std::string& example_text) const

toolsrc/src/VcpkgPaths.cpp

@@ -133,7 +133,7 @@ namespace vcpkg
     fs::path get_nuget_path(const fs::path& downloads_folder, const fs::path& scripts_folder)
     {
         static constexpr std::array<int, 3> expected_version = {4, 1, 0};
-        static const std::wstring version_check_arguments = L"";
+        static const std::wstring version_check_arguments = Strings::WEMPTY;
 
         const fs::path downloaded_copy = downloads_folder / "nuget-4.1.0" / "nuget.exe";
         const std::vector<fs::path> from_path = find_from_PATH(L"nuget");

toolsrc/src/vcpkg_Build.cpp

@@ -30,8 +30,8 @@ namespace vcpkg::Build
 
     CWStringView to_vcvarsall_target(const std::string& cmake_system_name)
     {
-        if (cmake_system_name == "") return L"";
+        if (cmake_system_name == Strings::EMPTY) return Strings::WEMPTY;
-        if (cmake_system_name == "Windows") return L"";
+        if (cmake_system_name == "Windows") return Strings::WEMPTY;
         if (cmake_system_name == "WindowsStore") return L"store";
 
         Checks::exit_with_message(VCPKG_LINE_INFO, "Unsupported vcvarsall target %s", cmake_system_name);
@@ -61,7 +61,7 @@ namespace vcpkg::Build
         const wchar_t* tonull = L" >nul";
         if (GlobalState::debugging)
         {
-            tonull = L"";
+            tonull = Strings::WEMPTY;
         }
 
         const auto arch = to_vcvarsall_toolchain(pre_build_info.target_architecture, toolset);
@@ -359,7 +359,7 @@ namespace vcpkg::Build
 
             const bool variable_with_no_value = s.size() == 1;
             const std::string variable_name = s.at(0);
-            const std::string variable_value = variable_with_no_value ? "" : s.at(1);
+            const std::string variable_value = variable_with_no_value ? Strings::EMPTY : s.at(1);
 
             if (variable_name == "VCPKG_TARGET_ARCHITECTURE")
             {

toolsrc/src/vcpkg_Checks.cpp

@@ -62,7 +62,7 @@ namespace vcpkg::Checks
     {
         if (!expression)
         {
-            exit_with_message(line_info, "");
+            exit_with_message(line_info, Strings::EMPTY);
         }
     }
 

toolsrc/src/vcpkg_Parse.cpp

@@ -30,7 +30,7 @@ namespace vcpkg::Parse
     }
     std::string ParagraphParser::optional_field(const std::string& fieldname)
     {
-        return remove_field(&fields, fieldname).value_or("");
+        return remove_field(&fields, fieldname).value_or(Strings::EMPTY);
     }
     std::unique_ptr<ParseControlErrorInfo> ParagraphParser::error_info(const std::string& name) const
     {

toolsrc/src/vcpkg_Strings.cpp

@@ -133,7 +133,7 @@ namespace vcpkg::Strings
             trim(&s);
         }
 
-        Util::erase_remove_if(*strings, [](const std::string& s) { return s == ""; });
+        Util::erase_remove_if(*strings, [](const std::string& s) { return Strings::is_empty(s); });
     }
 
     std::vector<std::string> split(const std::string& s, const std::string& delimiter)

toolsrc/src/vcpkglib.cpp

@@ -189,7 +189,7 @@ namespace vcpkg
 
         for (const std::unique_ptr<StatusParagraph>& pgh : status_db)
         {
-            if (pgh->state != InstallState::INSTALLED || pgh->package.feature != "")
+            if (pgh->state != InstallState::INSTALLED || !Strings::is_empty(pgh->package.feature))
             {
                 continue;
             }