1) Default constructor. Constructs an emptybasic_string_view.

2) Copy constructor. Constructs a view of the same content asother.

3) Constructs a view of the firststr.size() characters of the character array starting with the element pointed bystr.data().

4) Constructs a view of the firstcount characters of the character array starting with the element pointed bys.s can contain null characters. The behavior is undefined if[s, s+ count) is not a valid range (even though the constructor may not access any of the elements of this range).

5) Constructs a view of the null-terminated character string pointed to bys, not including the terminating null character. The length of the view is determined as if byTraits::length(s). The behavior is undefined if[s, s+ Traits::length(s)) is not a valid range (even though the constructor may not access any of the elements of this range).

4,5) Throws nothing.

1-4) Constant.

5) Linear in length ofs.

#include <experimental/string_view>#include <iostream> int main(){std::string cppstr="Foo";char array[3]={'B','a','r'}; std::experimental::string_view cppstr_v(cppstr);std::experimental::string_view array_v(array, sizeof array); std::experimental::wstring_view wcstr_v= L"xyzzy"; std::cout<< cppstr_v<<'\n'<< array_v<<'\n'<< wcstr_v.size()<<'\n';}

FooBar5