Initializing std::array of struct

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Hello everyone.
I tried to convert some intrinsic arrays into std::arrays in a C++ program with Visual Studio 2010.

No wonder this one could compile.

C++

typedef struct {
    int a;
    int b;
} A;

A arr[2] = {
    { 0, 1 },
    { 2, 3 }
};

But this one couldn't compile. It caused an error "error C2078: too many initializers".

C++

std::array<A, 2> arr = {
    { 0, 1 },
    { 2, 3 }
};

After trial and error for a while, I found that this one could compile.
(A couple of curly braces were added.)

C++

std::array<A, 2> arr = {{
    { 0, 1 },
    { 2, 3 }
}};

What is the cause or the reason? Somebody please explain it.

Posted 23-Sep-10 2:40am

Tsuda Kageyu

Updated 24-Sep-10 1:38am

v2

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Emilio Garavaglia 24-Sep-10 5:29am

Is C++0x support enabled?

Tsuda Kageyu 24-Sep-10 7:38am

Yes. I don't know how to disable it with VC++ 2010.

Ajay Vijayvargiya 27-Sep-10 14:53pm

Your question is well answered, this is about disabling C++0x, and other VC10 stuff.
Just change the compiler toolset (in project properties), from v100 to v90. You *must* have VS 2008 installed.

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Kozlov_Sergey · Answer 1 · 2010-09-23T03:02:00

Solution 1

I would use

A local_element;
local_element.a = 0;
local_element.b = 1;
arr.push(local_element);

local_element.a = 2;
local_element.b = 3;
arr.push(local_element);

or

const std::array<a,> arr = {    A( 0, 1 ),    A( 2, 3 )};

if you will write the constructor.

Posted 23-Sep-10 3:02am

Kozlov_Sergey