----- Original Message ----- From: "vicente.botet" <vicente.botet@wanadoo.fr> Newsgroups: gmane.comp.lib.boost.devel To: <boost@lists.boost.org> Sent: Friday, May 28, 2010 5:21 PM Subject: Re: [boost::endian] Request for comments/interest
int main() { struct MyClass { char data[12]; };
endian<little, MyClass> lil_1; endian<little, MyClass> lil_2; endian<big, MyClass> big_1;
lil_1 = lil_2; big_1 = lil_1; lil_2 = big_1;
} // main
Maybe, but what about more heterogeneus structures?
Ok, here's an actual example that compiles on VC9. (Notice how I worked in "chrono") terry #include "endian.hpp" #include <boost/units/systems/si.hpp> #include <boost/cstdint.hpp> #include <std0x/chrono.h> using namespace boost; using namespace boost::interface; using namespace boost::units; using namespace std0x; using namespace std0x::chrono; template<endian_t, int w1, int w2=0, int w3=0, int w4=0, int w5=0> struct bitfield { char placeholder[(w1 + w2 + w3 + w4 + w5 + 7)/8]; }; // bitfield namespace internet { #pragma pack(push ,1) struct IpHeader { bitfield<big, 4, 4> version_headerLength; enum { version, headerLength }; bitfield<big, 3, 1, 1, 1, 1> differentiated_services; enum { precedence, low_delay, high_thruput, high_reliability, minimize_cost }; endian<big, uint16_t> total_length; endian<big, uint16_t> identification; bitfield<big, 1, 1, 1, 13> flags_frag; enum { reserved, dont_frag, more_frag, frag_offset }; endian<big, uint8_t> time_to_live; endian<big, uint8_t> protocol; endian<big, uint16_t> header_checksum; endian<big, uint32_t> source_address; endian<big, uint32_t> destination_address; }; // IpHeader struct UdpHeader { endian<big, uint16_t> source_port; endian<big, uint16_t> destination_port; endian<big, uint16_t> length; endian<big, uint16_t> checksum; }; // UdpHeader #pragma pack(pop) } // internet #pragma pack(push, 1) struct UserMessage { endian<little, time_point<system_clock, duration<int64_t, nano> > > timestamp; endian<little, uint32_t> aircraft_id; struct Position { endian<little, quantity<si::length, int32_t> > x; endian<little, quantity<si::length, int32_t> > y; endian<little, quantity<si::length, int32_t> > z; } position; struct Attitude { endian<little, quantity<si::plane_angle, int8_t> > heading; endian<little, quantity<si::plane_angle, int8_t> > pitch; endian<little, quantity<si::plane_angle, int8_t> > roll; } attitude; }; // UserMessage struct Packet { internet::IpHeader ipHeader; internet::UdpHeader udpHeader; UserMessage userMessage; }; // Packet #pragma pack(pop) int main() { Packet packet; packet.ipHeader.source_address = 0x12345678; packet.udpHeader.destination_port = 1234; packet.userMessage.timestamp = system_clock::now(); packet.userMessage.position.y = 17 * si::meter; } // main