c++ 14 Categorized List of 3 Strings

Question

My brain is fried this morning, and I am struggling to understand why I am getting a compiler error.

error: no matching constructor for initialization of 'list<data::tweak_cat>'

My code is this:

#include <list>
#include <string>

// fire up our std namespace
using namespace std;

namespace data {

    // create a structure to hold the tweak data
    struct the_tweak {
        string _name;
        string _value;
        string _type;
    };

    // create a structure to hold our category data
    struct tweak_cat {
        string _category;
        list< the_tweak > data;
    };

    class properties {
        public:
            // return our lists of strings for the tweak properties
            static list< tweak_cat > tweak_properties( ) {
                // hold the return
                list< tweak_cat > _ret = { 
                    { "debugging", 
                        { "testing", "0", "" }, 
                    },
                    { "dozing", 
                        { "testing2", "this", "" }, 
                        { "testing3", "that", "" }, 
                        { "testing4", "0", "theother" }, 
                    },
                };
                
                // return it
                return _ret;
            }
    };
}

I am building a cli based set of tweaks for my phone, in the process attempting to teach myself some c++ and compiling for it. Where am I going wrong, and how can I correct it?

It is my understanding (from reading) that lists are the more efficient method to "store" this type of data, over vectors and arrays... I initially had these as vector< vector< string > > without the category parent, and it worked ok...

Answer 1

You need to add more braces because the structure is:

tweak_cat
{
   string,
   list
   {
       the_tweak { name, value, type },
       the_tweak { name, value, type },
       the_tweak { name, value, type },
   }
}

Code:

list<tweak_cat> _ret = {
    {
        "debugging",
        {
            {"testing", "0", ""}
        }
    },
    {
        "dozing",
        {
            {"testing2", "this", ""},
            {"testing3", "that", ""},
            {"testing4", "0", "theother"}
        }
    },
};

The above should compile.