How can I define an array inside an array in c++ similar to the python ease of defining of a list inside a list like
test = [[1,2,3], [4,5,6]]
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Maybe this could help you a bit.Adalee– Adalee2015-05-05 11:16:37 +00:00Commented May 5, 2015 at 11:16
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It depends how similar to a list of lists you want it to be.juanchopanza– juanchopanza2015-05-05 11:17:42 +00:00Commented May 5, 2015 at 11:17
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2 Answers
Consider these possibilities:
auto test = { { 1, 2, 3 }, { 4, 5, 6 } };
This creates test as a std::initializer_list that contains two std::initializer_list instances.
std::vector<std::vector<int>> test{ { 1, 2, 3 }, { 4, 5, 6 } };
creates a vector of vectors.
std::vector<std::array<int, 3>> test{ { 1, 2, 3 }, { 4, 5, 6 } };
creates a vector of fixed size arrays.
std::array<std::array<int, 3>, 2> test{ { 1, 2, 3 }, { 4, 5, 6 } };
creates a fixed size array (of size 2), containing two fixed size arrays of size 3, each.
Comments
#include <vector>
using namespace std;
vector<vector<int>> test = { {1, 2, 3}, {4, 5, 6} };
You will of course observe that there is a bit more typing. That's because c++ demands that you're more explicit about the actual properties of the container you're using. And that's because c++ is striving to ensure that you do exactly what you want to do.
