// single
vector<int> chart(16, 55);
vector<int>::iterator ChartEnd = chart.end();
for (vector<int>::iterator i = chart.begin(); i != ChartEnd; i++)
cout << *i << endl;
vector array 16 x 16
Author
I created a little console board game 16 x 16 with double array's
Mgame MainArray[ArraySize][ArraySize];
I want to make a similar game but using (STL) vectors
How can I use double array style with vectors, and how would I
iterate through them?
creating and using nested vectors:
filling that to be 16x16 is annoying.
it may be easier to do:
-me
std::vector< std::vector<int> > myVector;std::vector< std::vector<int> >::iterator it = myVector.begin();std::vector< std::vector<int> >::iterator ite = myVector.end();for( ; it != ite; ++it ){ std::vector<int>::iterator jt = (*it).begin(); std::vector<int>::iterator jte = (*it).end(); for( ; jt != jte; ++jt ) { int anInt = *jt; }}filling that to be 16x16 is annoying.
it may be easier to do:
//create and fill your vector with zerosstd::vector<int> myVector;myVector.reserve(16*16);std::fill_n(myVector.begin(), 16*16, 0);//retrieve dataint getXY( int x, int y ){ assert( x < 16 && y < 16 ); return myVector[ x + y*16 ];}//iterate:std::vector<int>::iterator ite = myVector.end();for( std::vector<int>::iterator it = myVector.begin(); it != ite; ++it ){ int anInt = *it;}-me
Author
I'm having trouble with the default constructor, I've tried a few different things all of them crashing the program. Im assigning int's to the vector.
My prefered choise would be "fill_n( )" its not working either.
My prefered choise would be "fill_n( )" its not working either.
#include <vector>#include <iterator>#include "Functions.h"using namespace std;class Sgame{private: vector<int> Map; vector<int> Ghost;public: // default constructor Sgame(){ // Map(256, 99); // no good // wanted to use "fill_n" but it made the program crash /*Map.reserve(ArraySize * ArraySize + ArraySize); // try'd to add extra space fill_n(Map.begin(),ArraySize * ArraySize, 33);*/ /*Ghost.reserve(ArraySize * ArraySize); fill_n(Ghost.begin(), (Ghost.end() + ArraySize * ArraySize), 1);*/ // crash program int x = 0; int y = 0; // turns out this crashes the program too //Ghost.reserve(ArraySize * ArraySize); //vector<int>::iterator Gend = Ghost.end() + (ArraySize * ArraySize); //for(vector<int>::iterator i = Ghost.begin(); i != Gend; i++, x++) // if(x == ArraySize){ // x = 0; // y++; // } // Set_GhostXY(99, x, y); // not sure how to pass along iterators so i use int's }/////////////////////////////// end default constructor // get infoint Get_MapXY(const int &x, const int &y){ if (x < ArraySize && y < ArraySize) return Map[x + y * ArraySize];}int Get_GhostXY(const int &x, const int &y){ if (x < ArraySize && y < ArraySize) return Ghost[x + y * ArraySize];} // set infovoid Set_MapXY(const int A, const int &x, const int &y){ Map[x + y * ArraySize] = A;}void Set_GhostXY(const int A, const int &x, const int &y){ Ghost[x + y * ArraySize] = A;} // print chartvoid PrintGhost(){vector<int>::iterator Cend = Ghost.end(); int y = 0; int x = 0; for (vector<int>::iterator Cbegin = Ghost.begin(); Cbegin != Cend; Cbegin++, x++){ if(x == ArraySize){ y++; cout << endl; x = 0;} //if(x == (ArraySize - 1) || y == 0 || x == 0 || y == (ArraySize - 1)){// set the borders of the board //*Cbegin = 11; //} cout << *Cbegin << " "; } cout << endl;}};
reserve only sets aside a chunk of memory for future use. You're not allowed to use that memory until/unless the vector is resized or otherwise grown to include it.
Σnigma
Sgame() : // initialisation in initialiser list, the best way Map(ArraySize * ArraySize, 33){ // using the assign member function Map.assign(ArraySize * ArraySize, 33); // using resize // this only sets new elements to the given value, // so can only be used here is the Map is empty Map.resize(ArraySize * ArraySize, 33); // using fill_n // if the map is already large enough there is no need to resize Map.resize(ArraySize * ArraySize); fill_n(Map.begin(), ArraySize * ArraySize, 33); // using fill // if the map is already large enough there is no need to resize Map.resize(ArraySize * ArraySize); fill_n(Map.begin(), Map.end(), 33);}Σnigma
Author
wow didnt know you could initialize outside the brackets.... thanks works great
// default constructor
Sgame() :
Map((ArraySize * ArraySize), 99), Ghost((ArraySize * ArraySize), 33)
{
}
// default constructor
Sgame() :
Map((ArraySize * ArraySize), 99), Ghost((ArraySize * ArraySize), 33)
{
}
Quote:Original post by pascalosti
wow didnt know you could initialize outside the brackets.... thanks works great
Its called an initialization list.
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