Re: [Boost-Users] shared_array with memcpy, help request

From: Beman Dawes (bdawes_at_[hidden])
Date: 2003-03-25 07:04:22

At 08:22 PM 3/24/2003, Blake D wrote:
 >Hello everyone :)
 >
 >I am a new boost user, and I'm trying to convert a large project to use 
the
 >smart pointers. I have a use for shared_array buy the memcpy line from 
the
 >following code snippet(, and all memcpy's) throw an exception with the
 >shared_arrays and I don't know why. Am I doing something obvious wrong?

Do you ever do a r_packet.reset( new uint8[data_length] )? Put a debugger 
breakpoint at entry to c_Packet, and see if r_packet has been reset.

HTH,

--Beman

 >
 >Thank you,
 >Blake
 >
 >//------------------class declaration
 >snippet---------------------------------
 >// Pointer to the packet
 >boost::shared_array<uint8> p_data;
 >// uint8 * p_data; <--- old working line
 >
 >//------------------class cpp file 
snippet---------------------------------
 >// copy Constructor
 >c_Packet::c_Packet (const c_Packet & r_packet)
 >{
 >data_length = r_packet.data_length;
 >
 >boost::shared_array<uint8> p_data(new uint8[data_length]);
 >// p_data = new uint8[data_length]; <--- old working line
 >
 >// Copy data from our source object to this object
 >memcpy(p_data.get(), r_packet.p_data.get(), data_length); // <- throws
 >exception!
 >// memcpy(p_data, r_packet.p_data, data_length); <---- old working line
 >
 >#ifdef DO_DEBUG
 >// cout << "packet copy constructor called" << endl ;
 >#endif // DO_DEBUG
 >}