Why parenthesized initializer list doesn't work for std :: array

Question

I want to initialize a vector or an array with a list of objects. It works for vectors, but not for arrays:

struct Widget
{
    string name;
    vector<int> list;
};

struct Object
{
    string name;
    vector<int> list;
    Object(string _name, vector<int> _list) : name(_name), list(_list) { }
};

int main()
{
    const vector<Widget> vw = {
        {"vw1", {1,2,3}},
        {"vw2", {1,2,3}} };
    const array<Widget,2> aw = {
        {"aw1", {1,2,3}},
        {"aw2", {1,2,3}} };
    const vector<Object> vo = {
        {"vo1", {1,2,3}},
        {"vo2", {1,2,3}} };
    const array<Object,2> ao = {
        {"ao1", {1,2,3}},
        {"ao2", {1,2,3}} };
    return 0;
}

Error from clang:

widget.cpp:36:9: error: excess elements in struct initializer
        {"aw2", {1,2,3}} };
        ^~~~~~~~~~~~~~~~
widget.cpp:41:10: error: no viable conversion from 'const char [4]' to 'Object'
        {"ao1", {1,2,3}},
         ^~~~~
widget.cpp:41:17: error: no matching constructor for initialization of 'Object'
        {"ao1", {1,2,3}},
                ^~~~~~~

What is the difference between a vector and an array that prevents the array type from supporting this syntax?

Answer 1

Here is a working solution - you need double brackets for arrays.

int main()
{
    const vector<Widget> vw = {
        {"vw1", {1,2,3}},
        {"vw2", {1,2,3}} };
    const array<Widget,2> aw = {{
        {"aw1", {1,2,3}},
        {"aw2", {1,2,3}} }};
    const vector<Object> vo = {
        {"vo1", {1,2,3}},
        {"vo2", {1,2,3}} };
    const array<Object,2> ao = {{
        {"ao1", {1,2,3}},
        {"ao2", {1,2,3}} }};
    return 0;
}

Why?

http://en.cppreference.com/w/cpp/container/array

std:: array - , . , , C- T [N] . C-, T * . , , N , T: std:: array a = {1,2,3};.

( )

template <typename T, size_t size> 
struct array  
{
  T data[size]; 
}

, , - , , - " C.".

Answer 2

:

int main()
{
    const std::array<Widget,2> aw = {
        {
            {"aw1", {1, 2, 3}},
            {"aw2", {1, 2, 3}}
        }
    };

    const std::array<Object, 2> ao = {
        {
            {"ao1", {1, 2, 3} },
            {"ao2", {1, 2, 3} }
        }
    };

    cout << aw[0].name << " " << aw[1].list[1] << endl;
    cout << ao[0].name << " " << ao[1].list[1] << endl;

    return 0;
}

:

aw1 2
ao1 2

, std::array , .

a std::array , N. , , std::array ( )