error: new : cannot specify initializer for arrays

powah · 02-01-2007, 09:48 AM

Code:

#include <vector>
#include <iostream>

using std::cout;
using std::vector;

enum {DATASIZE = 20};
typedef unsigned char data_t[DATASIZE];


int setvalue(UInt8 *pValue)
{
    for (int i = 0; i < DATASIZE; i++)
       pValue[i] = '1' + i;
    return 0;
}

void displayvalue(UInt8 *pValue)
{
    for (int i = 0; i < DATASIZE; i++)
        cout << pValue[i] << "\n";
}


int main(int argc, char* argv[])
{
    enum {MAX_PROC = 5, MAX_OBJECT = 10000};

    // I want to use vector instead of array because the array size is determined by a variable
    //data_t data[MAX_PROC][MAX_OBJECT];

    vector<data_t> v[MAX_PROC] (10); // compile error here!
    for (int i = 0; i < MAX_PROC; i++) {
       setvalue(v[i][0]);
    }
    cout << "data\n";
    for (i = 0; i < MAX_PROC; i++) {
        displayvalue(v[i][0]);
    }

    return 0;
}

The above program is a test program to test how to use vector instead of array for my own project, so the setvalue and displayvalue function is simplied for test purpose (they are actually functions from another library which I cannot change).
I want to keep data_t defined as an array of unsigned char.
There is a compile error for the above program:
error: new : cannot specify initializer for arrays

How to fix this compile error?
Thanks in advance.

asgeirss · 02-01-2007, 01:58 PM

Hi,

The nice thing about <vector> and related classes, is that you don't have to statically declare their size at compile time! This means that your declaration is invalid, because you don't give a dimension to v, it is sized dynamically during execution as you append and remove items from the vector. e.g.

vector<data_t> v;
for (int i = 0; i < MAX_PROC; i++) v.push_back(data[i]);

For some examples of 2 and 3D, look at the following web page:
http://www.yolinux.com/TUTORIALS/Lin...TL.html#VECTOR

Basically 2,3d vectors (matrices) are just vectors of vectors, etc.
Good luck.
- Dave

powah · 02-01-2007, 04:15 PM

Quote:

Originally Posted by asgeirss

Hi,

The nice thing about <vector> and related classes, is that you don't have to statically declare their size at compile time! This means that your declaration is invalid, because you don't give a dimension to v, it is sized dynamically during execution as you append and remove items from the vector. e.g.

vector<data_t> v;
for (int i = 0; i < MAX_PROC; i++) v.push_back(data[i]);

For some examples of 2 and 3D, look at the following web page:
http://www.yolinux.com/TUTORIALS/Lin...TL.html#VECTOR

Basically 2,3d vectors (matrices) are just vectors of vectors, etc.
Good luck.
- Dave

Code:

    vector<data_t> v[MAX_PROC]; // this will compile
    for (int i = 0; i < MAX_PROC; i++) {
       setvalue(v[i][0]); // run time error
    }

If I do not declare their size at compile time, then there is a core dump at setvalue(v[i][0]);
I cannot change the function setvalue.
What can I do?