int plugin::feature(const InstanceInput &input) {

    auto parse_word=[](const string input_text){
        string text = input_text;
        int i=text.find("%");
        if(i!=-1){
            return text.substr(0, i);
        }
        return "";
    };

     ....
}

I am in Clion and it displays an error message at the 'return' statement saying that:

return type const char* must match previous return type std:basic_string<char> when lambda expression has unspecified specific return type 

How to fix this?

CodePudding user response：

Instead of:

        if(i!=-1){
            return text.substr(0, i);
        }
        return "";

Try

        if(i!=-1){
            return text.substr(0, i);
        }
        return std::string();

auto return type for your lamda has been determined as string in the first case, and as char* in the second, which is a mismatch.