Question

I get two variables a and b and want to add them directly to a list of arrays. How can I avoid to define another array, which will be pushed into the list afterwards?

I am searching for a construction similar to the line beginning with //.

Minimal example:

#include <list>
#include <boost/array.hpp>

using namespace std;

int main()
{
    cout << endl;

    /* given values */
    int a = 1;
    int b = 2;

    /* arrayList contains arrays of integers. */
    list<boost::array<int, 2> > arrayList;

    /* item to add values */
    boost::array<int, 2> item;

    item[0] = a;
    item[1] = b;
    arrayList.push_back(item);

//  arrayList.push_back({{a, b}});

    cout << arrayList.front()[0] << ", " << arrayList.front()[1] << endl;

    return 0;

}

My g++ version is the following:
gcc-Version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5).

Compiling (within Eclipse) throws this warning listed as an error:
Warnung: erweiterte Initialisierungsliste nur mit -std=c++0x oder -std=gnu++0x verfügbar [standardmäßig aktiviert] main.cpp /testArrayListAndFind line 24 C/C++ Problem
which means: Extended initilization list only with ... or ... available.

Answer 1

You could use boost::assign::list_of if you don’t have C++11 support:

arrayList.push_back(boost::assign::list_of(1)(2));