Affected subclause: [basic.string]
 Change: Non-const 
.data() member added
.   Rationale: The lack of a non-const 
.data()
differed from the similar member of 
std::vector.  This change regularizes behavior
.Effect on original feature: Overloaded functions which have differing code paths
for 
char* and 
const char* arguments
will execute differently
when called with a non-const string's 
.data() member
in this revision of C++
.  For example:
int f(char *) = delete;
int f(const char *);
string s;
int x = f(s.data());