Why Does GCC 4.6.1 Struggle with Initialization Lists for std::array?

Using Initialization Lists with std::array

It is possible to create a std::array using initialization lists in several ways. However, GCC 4.6.1 may encounter errors when attempting this.

Initialization Syntax

The syntax for creating a std::array using initialization lists is:

<code class="cpp">std::array<T, size> array = { { value1, value2, ..., valueN } };</code>

where T is the array's element type, size is the array's size, and value1 to valueN are the array's initial values.

Aggregate Initialization

std::array is an aggregate struct, which allows it to be aggregate-initialized. To aggregate-initialize the array inside the struct, use an additional set of curly braces:

<code class="cpp">std::array<std::string, 2> strings = {{ "a", "b" }};</code>

This syntax avoids the constructor that takes an initializer list, which may cause problems in GCC 4.6.1.

Compiler Issue

The C 11 standard suggests that the extra curly braces can be elided in aggregate initialization. Therefore, the inability of GCC 4.6.1 to compile initialization lists for std::array without the extra braces is likely a compiler bug.

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