I really don't know what to do here. Every answer I look up has syntax that I just don't understand.
error:
Error 1 error C2064: term does not evaluate to a function taking 1 arguments
I'm using a function pointer in a hash table constructor. It was suggested that I use the and headers to solve an issue I was having. It solved the errors, but I ran into the above error.
my Hash Table declaration and ctor are as follows:
#pragma once
#include "SLList.h"
template<typename Type> class HTable
{
public:
HTable(unsigned int numOfBuckets, std::function<unsigned int(const Type&)> hFunction);
~HTable();
HTable<Type>& operator=(const HTable<Type>& that);
HTable(const HTable<Type>& that);
void insert(const Type& v);
bool findAndRemove(const Type& v);
void clear();
int find(const Type& v) const;
private:
SLList<Type>* ht;
std::function<unsigned int(const Type&)> hFunct;
unsigned int numOfBuck;
};
template<typename Type>
HTable<Type>:: HTable(unsigned int numOfBuckets, std::function<unsigned int(const Type&)> hFunction)
{
ht = new SLList<Type>[numOfBuckets];
this->numOfBuck = numOfBuckets;
this->hFunct = hFunction;
}
Game.h (containing the table):
#pragma once
#include "stdafx.h"
#include "HTable.h"
#include "BST.h"
#include "DTSTimer.h"
using namespace std;
class Game
{
public:
Game(void);
virtual ~Game(void);
void refresh();
void input();
unsigned int xorHash(const string &s);
private:
string userInput;
DTSTimer timer;
BST<string> answers;
HTable<string> dictionary;
};
Game.cpp (I am attempting to pass in the xorHash function)
#include "Game.h"
Game::Game(void) : dictionary(2048, std::bind(&Game::xorHash, this))
{
}
Game::~Game(void)
{
}
void Game::refresh()
{
}
void Game::input()
{
}
unsigned int Game::xorHash(const string &s)
{
return 0;
}
Thanks in advance.
You need a placeholder for the unbound function argument:
std::bind(&Game::xorHash, this, std::placeholders::_1)
A lambda might be more readable, according to taste:
[this](const std::string & s){return xorHash(s);}
Although it's not clear to me why xorHash
needs to be a non-static member at all; surely, a hash should depend only on its input?