This is as list of known incompatibilities between the QPB ( aka lua-pb-reflect ) code and the C++ code.

64 bit numbers

Lua doesn't natively support big numbers. I briefly thought about using strings, but then most major math operations wouldn't work. Instead, QPB uses doubles when transferring data in and out of 64 bit fields.

Mutable Strings

There are two methods in the standard C++ generated code which return mutable strings. QPB does not support these methods.

``` // gains access to the memory of a string field // does not work in lua with QPB xavier= msg.mutable_string_field() xavier= "alters the msg memory."

// appends a string to the array_of_strings and returns it // does not work in lua with QPB xander= msg.add_array_of_strings() xander= "sets the contents of the newly added string." ```

QPB would need a new proxy object to handle these methods, and even then, I'm not sure it would be able to handle the methods well. The proxies would be like lua strings, but never quite exactly.

The other string accessors do work, though, so you should still be able to achieve whatever you need: ``` string xavier="i can read your mind." msg.set_string( xavier )

string xander="trying not to think..." msg.add_array_of_strings( xander ) msg.add_array_of_strings( xander ) ```