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Editorial Team
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Asked: 2026-06-15T06:23:27+00:00

I wrote a hash table class and header but I cannot construct it on

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I wrote a hash table class and header but I cannot construct it on main. It gives “no appropriate default constructor available”. What is the cause of that?

Constructor in my header: HashTable.h

explicit HashTable( const HashedObj & notFound, int size = 101 );
        HashTable( const HashTable & rhs )
        : ITEM_NOT_FOUND( rhs.ITEM_NOT_FOUND ),
        array( rhs.array ), currentSize( rhs.currentSize ) { }

Constructor in my cpp: HashTable.cpp

    HashTable<HashedObj>::HashTable( const HashedObj & notFound, int size )
    : ITEM_NOT_FOUND( notFound ), array( nextPrime( size ) )
{
    makeEmpty( );
}

And I’m trying to do following code in my main:

HashTable <int> * hash = new HashTable<int>();
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1 Answer

  1. Editorial Team
    HashTable <int> * hash = new HashTable<int>();

    You’ve defined a constructor which takes argument, but here you’re not passing arguments to the constructor. Instead you’re using a parameterless (default) constructor which doesn’t exist in your class.

    Note that if you’ve defined a constructor (which takes argument(s)) in your class, then the compiler will not generate a default constructor for you. You’ve to define it yourself.

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