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#include <iostream>
#include <vector>
 
const int BLOCK_SZ = 64 / (sizeof(char) * 8);
typedef char block[BLOCK_SZ];
 
int main() {
    std::vector<block> ssx(10);
    ssx[0][0] = 'X';
    for (auto &i : ssx) {
    	std::cout << i;
    }
 
    return 0;
}

In file included from /usr/include/c++/4.8/vector:63:0,
                 from prog.cpp:2:
/usr/include/c++/4.8/bits/stl_uninitialized.h: In instantiation of ‘static void std::__uninitialized_default_n_1<true>::__uninit_default_n(_ForwardIterator, _Size) [with _ForwardIterator = char (*)[8]; _Size = unsigned int]’:
/usr/include/c++/4.8/bits/stl_uninitialized.h:544:33:   required from ‘void std::__uninitialized_default_n(_ForwardIterator, _Size) [with _ForwardIterator = char (*)[8]; _Size = unsigned int]’
/usr/include/c++/4.8/bits/stl_uninitialized.h:605:50:   required from ‘void std::__uninitialized_default_n_a(_ForwardIterator, _Size, std::allocator<_Tp>&) [with _ForwardIterator = char (*)[8]; _Size = unsigned int; _Tp = char [8]]’
/usr/include/c++/4.8/bits/stl_vector.h:1225:28:   required from ‘void std::vector<_Tp, _Alloc>::_M_default_initialize(std::vector<_Tp, _Alloc>::size_type) [with _Tp = char [8]; _Alloc = std::allocator<char [8]>; std::vector<_Tp, _Alloc>::size_type = unsigned int]’
/usr/include/c++/4.8/bits/stl_vector.h:271:34:   required from ‘std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>::size_type, const allocator_type&) [with _Tp = char [8]; _Alloc = std::allocator<char [8]>; std::vector<_Tp, _Alloc>::size_type = unsigned int; std::vector<_Tp, _Alloc>::allocator_type = std::allocator<char [8]>]’
prog.cpp:8:30:   required from here
/usr/include/c++/4.8/bits/stl_uninitialized.h:515:42: error: functional cast to array type ‘_ValueType {aka char [8]}’
    std::fill_n(__first, __n, _ValueType());
                                          ^

Standard output is empty