Fill dynamic array using curly bracket notation C++

Question

Is there a way in c++ to fill an array allocated like this

int **a = new int[4][2];

so that it's filled with values in one line like this

int a [4][2] = {{2,3,4},{5,6,7}};

This has been asked many, many times, and the answer is still "no" (or `for (i = 2; i < 8; i++)`...) — , Feb 08 '13 at 19:07
@djechlin [Just the first Google hit](http://stackoverflow.com/questions/2029651/how-do-you-initialise-a-dynamic-array-in-c), there are better dupes, though (left to you as an exercise) — , Feb 08 '13 at 19:16

score 6 · Accepted Answer · answered Feb 08 '13 at 19:17

6

int(*a)[2] = new int[2][2]{{1,2},{3,4}};

answered Feb 08 '13 at 19:17

Maxim Egorushkin

TemplateRex · Answer 2 · 2013-02-08T19:12:41.737

0

a vector of vectors would work, but only in C++11. I guess you'd have to give up C compatibility for that

#include <vector>

int main()
{
   std::vector<std::vector<int>> v = {{2,3,4},{5,6,7}};   
}

edited Feb 08 '13 at 19:12

answered Feb 08 '13 at 19:07

TemplateRex

With a C++11 enabled compiler that supports initializer lists. – Aeluned Feb 08 '13 at 19:13
@Aeluned, yeah so Clang, gcc, Intel now, or MSVC anytime soon – TemplateRex Feb 08 '13 at 19:18
@rhalbersma "or MSVC anytime soon" - you must be kidding. – Feb 08 '13 at 19:23
@H2CO3 VC++ 2012 November CTP supports initializer lists, but not yet in the Standard Library (i.e. not for `std::vector`), so the RTM version will support it. I'm guessing that will not take long anymore. – TemplateRex Feb 08 '13 at 19:24

score 0 · Answer 3 · 2013-02-08T19:28:00.307

0

Prefer std::array to C-style arrays if your compiler has adequate C++11 support:

#include <array>

int main()
{
    std::array<std::array<int,3>,3> v = {1,2,3,4,5,6,7,8,9};
}

edited Feb 08 '13 at 19:28

answered Feb 08 '13 at 19:16

3 Answers3