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MSVS2013 debug configuration:
The test program with this code hangs after reaching the end of scope:

Array a(2);
a.set(0, 42);
a.set(1, 69);
Array b(a);

MSVS2013 release configuration:
triggered a breakpoint at free.c

Ubuntu:
*** Error in `./test': double free or corruption (fasttop): 0x000000000188d010 ***

What happens:
Default copy constructor sets b.myData = a.myData.
Destructor of a deletes the myData array.
Then, destructor of b is called, tries to delete the same array and never succeeds.

Solution:
Create a custom copy constructor

g++ Array.cpp Test.cpp
In file included from Array.cpp:1:0:
Array.h:5:2: error: ‘size_t’ does not name a type

Array a(2);
a.set(0, 42);
a.set(1, 69);
Array c(1);
c = a;

MSVS2013 debug:
Debug Assertion Failed!
File: f:\dd\vctools\crt_bld\self_x86\crt\src\dbgdel.cpp
Line: 52
Expression: _BLOCK_TYPE_IS_VALID(pHead->nBlockUse)

MSVS2013 release:
breakpoint at free.c

Ubuntu:
works fine