CODEWITHSUNDEEP
c++c++11
Mihai Bişog
Mihai Bişog

Reputation: 1018

How do you initialize (through initializer lists) a multidimensional std::array in C++11?

I am trying to initialize a 2D std::array trough initializer lists however the compiler tells me that there are too many initializers.

e.g.: 

std::array<std::array<int, 2>, 2> shape = { {1, 1},
                                            {1, 1} };

Compiler error: error: too many initializers for ‘std::array<std::array<int, 2ul>, 2ul>’

But clearly there aren't too many. Am I doing something wrong?

Upvotes: 14

Views: 4320

Answers (2)

kennytm
kennytm

Reputation: 523614

Try to add one more pair {} to ensure we're initializing the internal C array.

std::array<std::array<int, 2>, 2> shape = {{ {1, 1},
                                             {1, 1} }};

Or just drop all the brackets.

std::array<std::array<int, 2>, 2> shape = { 1, 1,
                                            1, 1 };

Upvotes: 14

Basile Starynkevitch
Basile Starynkevitch

Reputation: 1

I would suggest (without even have trying it, so I could be wrong)

typedef std::array<int, 2> row;
std::array<row,2> shape = { row {1,1}, row {1,1} };

Upvotes: 7

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