Add operator == for acl::string for comparing "ok" == acl::string.

lib_acl_cpp/include/acl_cpp/stdlib/string.hpp

@@ -1319,6 +1319,13 @@ private:
 	void init(size_t len);
 };
 
+/**
+ * string s = "ok";
+ * printf("first: %s\r\n", "ok" == s ? "true" : "false");
+ */
+bool operator==(const string* s,const string& str);
+bool operator==(const char* s,const string& str);
+
 /**
  * 模板函数，可用在以下场景:
  * string s1, s2;

lib_acl_cpp/samples/string/string1/main.cpp

@@ -271,6 +271,17 @@ static void test7(void)
 	ACL_METER_TIME(">> end ACL_VSTRING: acl_vstring_sprintf");
 }
 
+static void test8(void)
+{
+	acl::string s = "ok";
+	acl::string s1 = "ok", *sp = &s1;
+
+
+	printf("s==\"ok\" : %s, \"ok\"==s : %s\r\n",
+		s == "ok" ? "yes" : "no", "ok" == s ? "yes" : "no");
+	printf("sp=s : %s\r\n", sp == s ? "yes" : "no");
+}
+
 //////////////////////////////////////////////////////////////////////////
 
 static void test_main(void)
@@ -429,6 +440,9 @@ int main(void)
 	{
 		printf("%s\r\n", (*cit).c_str());
 	}
+
+	test8();
+
 #ifdef WIN32
 	printf("enter any key to exit\r\n");
 	getchar();

lib_acl_cpp/src/stdlib/string.cpp

@@ -1952,4 +1952,14 @@ string& string::parse_int64(acl_uint64 n)
 	return s;
 }
 
+bool operator==(const string* s,const string& str)
+{
+	return (str == s);
+}
+
+bool operator==(const char* s,const string& str)
+{
+	return (str == s);
+}
+
 } // namespace acl