我注意到了
std::string str;
str += 'b'; // works
str.append('b'); // does not work
str.append(1, 'b'); // works, but not as nice as the previous
是否有任何理由说明该append方法不支持附加单个字符？我假设它operator+=实际上是该append方法的包装器,但似乎并非如此.