CODEWITHSUNDEEP
c++
allen.lao
allen.lao

Reputation: 49

C++ No matching constructor

Recently, I've begun studying C++, and this is my first C++ program - but it does not work.

Error message:

No matching constructor for initialization of "Document".

The IDE I use is Xcode.

    class Document {

    private:

    int doc_id;
        int lan_id;
        std::vector<int>::size_type n_total;
        std::vector<int> words;
        std::vector<int> counts;

        inline int doc_type(){return (counts.empty() && !words.empty())? 1:0;};
    public:

        Document(int docId)
        {
            doc_id = docId;
            n_total = 0;
        }
        Document(int docId, int lanId)
        {
            lan_id = lanId;
            doc_id = docId;
            n_total = 0;
        }

        inline void add(int word, int count)
        {
            words.push_back(word);
            counts.push_back(count);
        }
        inline void add(int word) { words.push_back(word);}
        inline int word(int i) { return words[i]; }
        inline int count() { return counts[1];};
        inline std::vector<int>::size_type size() {  return n_total;};
        inline void setSize(std::vector<int>::size_type total){ n_total = total;};
        inline std::vector<int>::size_type  types() { return words.size();}

        ~ Document()
        {
            words.clear();
            counts.clear();
        }
    };

Upvotes: 0

Views: 2612

Answers (2)

taocp
taocp

Reputation: 23624

My guess is that you are trying to instantiate your Document class by using default constructor, however, you do not have a default constructor defined in you code. You only defined two overloaded versions of the constructor in your public section:

Document(int docId, int lanId)

and 

Document(int docId)

If you instantiate your object as follows

Document d;

it will give you compile error since compiler cannot find a default constructor to finish the creation of the object. Meanwhile, you have defined your own constructors, so compiler will not generate a default constructor for you.

Besides, you have several places that put redundant semicolons there, which is error-prone and should not be there.

For example:

 inline int doc_type(){return (counts.empty() && !words.empty())? 1:0;};
                                                                     //^^^^
 inline int count() { return counts[1];};
 inline std::vector<int>::size_type size() {  return n_total;};
 inline void setSize(std::vector<int>::size_type total){ n_total = total;};

Upvotes: 3

Mike Seymour
Mike Seymour

Reputation: 254431

The problem is in the code you haven't shown us, where you try to create an object of this type. You need to use one of the defined constructors: 

Document d1(docId); 
Document d2(docId, lanId);

My wild guess is that you're trying to default-construct one:

Document d;

The class doesn't (and probably shouldn't) have a default constructor Document(), so this won't work.

Upvotes: 2

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