Fix #14085 Add isExplicit attribute to operators (#7761)

Author: olabetskyi

lib/symboldatabase.cpp

@@ -2578,8 +2578,6 @@ Function::Function(const Token *tok,
         // constructor of any kind
         else
             type = FunctionType::eConstructor;
-
-        isExplicit(tokenDef->strAt(-1) == "explicit" || tokenDef->strAt(-2) == "explicit");
     }
 
     const Token *tok1 = setFlags(tok, scope);
@@ -2653,6 +2651,14 @@ Function::Function(const Token *tok,
         isInline(true);
         hasBody(true);
     }
+
+    for (tok = tokenDef->previous(); Token::Match(tok, "&|&&|*|::|)|]|%name%"); tok = tok->previous()) {
+        // We should set other keywords here as well
+        if (tok->str() == "explicit")
+            isExplicit(true);
+        if (tok->str() == "]" || tok->str() == ")")
+            tok = tok->link();
+    }
 }
 
 Function::Function(const Token *tokenDef, const std::string &clangType)

test/testsymboldatabase.cpp

@@ -430,6 +430,7 @@ class TestSymbolDatabase : public TestFixture {
         TEST_CASE(symboldatabase109); // #13553
         TEST_CASE(symboldatabase110);
         TEST_CASE(symboldatabase111); // [[fallthrough]]
+        TEST_CASE(symboldatabase112); // explicit operator
 
         TEST_CASE(createSymbolDatabaseFindAllScopes1);
         TEST_CASE(createSymbolDatabaseFindAllScopes2);
@@ -5841,6 +5842,17 @@ class TestSymbolDatabase : public TestFixture {
         ASSERT(case3 && case3->isAttributeFallthrough());
     }
 
+    void symboldatabase112() { // explicit operator
+        GET_SYMBOL_DB("class S {\n"
+                      "    explicit constexpr operator bool() const noexcept { return ptr_ != nullptr; }\n"
+                      "private:\n"
+                      "    void *ptr_{nullptr};\n"
+                      "};\n");
+        const Token *f = db ? Token::findsimplematch(tokenizer.tokens(), "operatorbool") : nullptr;
+        ASSERT(f != nullptr);
+        ASSERT(f && f->function() && f->function()->isExplicit());
+    }
+
     void createSymbolDatabaseFindAllScopes1() {
         GET_SYMBOL_DB("void f() { union {int x; char *p;} a={0}; }");
         ASSERT(db->scopeList.size() == 3);