c++ - MSVS 2015: vector<bool> has no 'data' member -

i have following code compiles fine:

void foo::bar(const vector<int> arg) {     int* ptr = arg.data();     // ptr } 

i need overload function vector<bool>

void foo::bar(const vector<bool> arg) {     int* ptr = arg.data();      // error c2039: 'data': not member ofstd::vector<bool,std::allocator<_ty>>'     // ptr } 

what reason vector<bool> not have data() member?

here (en.cppreference.com) did not find somethign specific bool case of std::vector.

the code compiled msvs 2015.

usual vector<t> store data 1 contiguous block of t's, it's possible return pointer them array.

vector<bool> stores several boolean values in 1 byte, it's not possible return such pointer