Just to be clear: Cap'n Proto specifies that floats are encoded as IEEE-754. This happens to be the representation used by all supported platforms at present. So there should be no data loss from a round trip.
(Exception: NaNs are weird. Per IEEE-754, there's a bunch of bits in a NaN that you can use to encode extra information, but Cap'n Proto does not guarantee that those bits will make it to the other end because different architectures treat them differently. But if you treat all NaNs the same you should be fine.) -Kenton On Wed, Nov 1, 2017 at 6:04 PM, Krzysztof Sakrejda < [email protected]> wrote: > I have a schema like so: > > struct Initialization { > random @0 :Bool = true; > radius @1 :Float64 = 1.0; > file @2 :Text; > } > > and a matching test file to make sure I understand behavior: > > TEST(initilizationTests, MemoryInitialization) { > > const char * initialization_file = "initialize.cs"; > > ::capnp::MallocMessageBuilder message; > capnStan::Initialization::Builder init = message.initRoot<capnStan:: > Initialization>(); > init.setRandom(true); > init.setRadius(3.3); > init.setFile(initialization_file); > > EXPECT_EQ(init.getRandom(), true); > EXPECT_DOUBLE_EQ(init.getRadius(), 3.3); > EXPECT_EQ(init.getRadius(), 3.3); > EXPECT_EQ(std::string(init.getFile().cStr()), > std::string(initialization_file)); > } > > I was hoping to round-trip a double successfully through the 'radius' > field and it works (in so far as the > floating point equality and exact equality tests pass). They likewise > pass for a test that writes the message > to a file in between. I was expecting/hoping that this would be the case > on a single machine. > > I'm not so sure about shipping the file between machines with different > hardware and what to expect > there. Does anybody have experience with that offhand? > > -- > You received this message because you are subscribed to the Google Groups > "Cap'n Proto" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > Visit this group at https://groups.google.com/group/capnproto. > -- You received this message because you are subscribed to the Google Groups "Cap'n Proto" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/capnproto.
