str_ptr.ptr returns exactly the same thing as str.ptr or
(*str_ptr).ptr, a pointer to the contents. When you write
str_ptr, you print the pointer to the container.
So str.ptr is just shortcut?
Ok, but how to free memory from first located value (from `aaa`)?
I changed my code to next:
import std.stdio;
import std.string;
import core.memory;
void main()
{
string str = "aaa".dup;
string *str_ptr = &str;
writeln("before: ", str_ptr.ptr);// address of structure
writeln(*str_ptr.ptr); // address of data
str = "bbbb"; // now writing to structure new data, so ptr
would be point to them
writeln("after: ", str_ptr.ptr);
writeln("length: ", str_ptr.length);
writeln("str_ptr point to: ", *str_ptr.ptr);
writeln(str_ptr);
writeln("before dealloc: ", str_ptr.length);
//GC.free(str_ptr.ptr); // Error: function
core.memory.GC.free (void* p) is not callable using argument
types (immutable(char)*)
writeln(str_ptr);
writeln("after dealloc: ", str_ptr.length);
}
But I can't call `GC.free(str_ptr.ptr)` on string type, only on
`char []`
