Fix #14085 Add isExplicit attribute to operators

Author: olabetskyi

lib/symboldatabase.cpp

@@ -2555,6 +2555,8 @@ Function::Function(const Token *tok,
     if (::isOperator(tokenDef)) {
         isOperator(true);
 
+        isExplicit(tokenDef->strAt(-1) == "explicit" || tokenDef->strAt(-2) == "explicit");
+
         // 'operator =' is special
         if (tokenDef->str() == "operator=")
             type = FunctionType::eOperatorEqual;

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);