Refs #4412: using namespace std; not simplified (constructor) (#8477)

Co-authored-by: chrchr-github <noreply@github.com>

Author: chrchr-github

lib/tokenize.cpp

@@ -10344,6 +10344,13 @@ static bool isStdSmartPointer(const Token* tok, const Settings& settings)
     return ptr && startsWith(ptr->name, "std::");
 }
 
+static bool isLibraryType(const Token* tok, const Settings& settings)
+{
+    return settings.library.hasAnyTypeCheck("std::" + tok->str()) ||
+           settings.library.podtype("std::" + tok->str()) ||
+           isStdContainerOrIterator(tok, settings);
+}
+
 // Add std:: in front of std classes, when using namespace std; was given
 void Tokenizer::simplifyNamespaceStd()
 {
@@ -10371,14 +10378,13 @@ void Tokenizer::simplifyNamespaceStd()
                 if (start != tok && start->isName() && !start->isKeyword() && (!start->previous() || Token::Match(start->previous(), "[;{}]")))
                     userFunctions.insert(tok->str());
             }
-            if (userFunctions.find(tok->str()) == userFunctions.end() && mSettings.library.matchArguments(tok, "std::" + tok->str()))
+            if ((userFunctions.find(tok->str()) == userFunctions.end() && mSettings.library.matchArguments(tok, "std::" + tok->str())) ||
+                (tok->tokAt(-1)->isKeyword() && isLibraryType(tok, mSettings)))
                 insert = true;
         } else if (Token::simpleMatch(tok->next(), "<") &&
                    (isStdContainerOrIterator(tok, mSettings) || isStdSmartPointer(tok, mSettings)))
             insert = true;
-        else if (mSettings.library.hasAnyTypeCheck("std::" + tok->str()) ||
-                 mSettings.library.podtype("std::" + tok->str()) ||
-                 isStdContainerOrIterator(tok, mSettings))
+        else if (isLibraryType(tok, mSettings))
             insert = true;
         else if (Token::simpleMatch(tok, "aligned_storage"))
             insert = true;

test/testtokenize.cpp

@@ -5288,12 +5288,7 @@ class TestTokenizer : public TestFixture {
                        "if ( ! p ) {\n"
                        "throw std :: runtime_error ( \"abc\" ) ; }\n"
                        "}";
-            TODO_ASSERT_EQUALS(expected,
-                               "void f ( const std :: unique_ptr < int > & p ) {\n"
-                               "if ( ! p ) {\n"
-                               "throw runtime_error ( \"abc\" ) ; }\n"
-                               "}",
-                               tokenizeAndStringify(code));
+            ASSERT_EQUALS(expected, tokenizeAndStringify(code));
         }
 
         {
@@ -5315,6 +5310,17 @@ class TestTokenizer : public TestFixture {
                        "}";
             ASSERT_EQUALS(expected, tokenizeAndStringify(code));
         }
+
+        {
+            const char code[] = "using namespace std;\n"
+                                "string_view f() { return string(); }\n"
+                                "void move() {}\n"
+                                "void string() {}\n";
+            expected = "std :: string_view f ( ) { return std :: string ( ) ; }\n"
+                       "void move ( ) { }\n"
+                       "void string ( ) { }";
+            ASSERT_EQUALS(expected, tokenizeAndStringify(code));
+        }
     }
 
     void microsoftMemory() {