Differences between string in linux and windows

String a ("aaaa ");
String B;
B =;
Const char * p1 = a. c_str ();
Const char * p2 = B. c_str ();
If (p1 = p2)
{
Printf ("true ");
}
Else
{
Printf ("false ");
}
 
The above code outputs false in windows and true in linux.
The reason is that in linux, the write copy is used, so when the compiler assigns a value, it does not allocate memory, and a and B share the same memory. The memory is allocated only when the function B in string is changed.
Note that the string function is used. the pointer obtained by c_str () is forced to modify B, because this modification bypasses the copy at write time, And a and B share the same memory, so a also changes.
This article is from the "starting" blog