How is Default Initialization Handled for `std::array` in C 11?

Default Initialization of C 11's std::array

Default initialization, performed when no explicit initializer is specified, is guaranteed by the C language standard for all objects without an explicit initializer, including instances of std::array and T[N] (§8.5/11).

However, it's important to note that default initialization has no effect on non-class, non-array types, leaving their value indeterminate (§8.5/6). For example, a default-initialized array of such types will have indeterminate values:

<code class="cpp">int plain_int;
int c_style_array[13];
std::array<int, 13> cxx_style_array;</code>

To explicitly initialize all elements to T{}, use value-initialization (8.5/7):

<code class="cpp">int plain_int{};
int c_style_array[13]{};
std::array<int, 13> cxx_style_array{};</code>

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