Exception safety clarification #17
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@dureuill I'd appreciate it if you could review the code and text change. |
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Changing FFIStringCpp to something that is not considered a POD type by the type system revealed a subtle, but previously effectless issue. The custom _by comparison constructs treated the types as the original FFI types and not as the derived C++ types. This did not have any effect because all derived types had the same POD semantics, and the comparison function was provided by the Rust side. But with FFIStringCpp changing to a non-trivially copyable move only type, this issue was revealed. The fix is to provide the comparison constructs with the derived type and to take a comparison function-pointer as generic template parameter to decouple T and the parameter type of the function-pointer. In addition the Rust side now understands FFIString in a moved from state and can safely destroy such values.
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Fixes #16 see commit messages for detailed explanations.