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rosidl_generator_cpp: Initial changes for cpp17 features, ie std::optional #738

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rosidl_generator_cpp: Initial changes for cpp17 features, ie std::optional #738

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Commits on Apr 7, 2023

  1. rosidl_generator_cpp: Initial changes for cpp17 features, ie std::opt… 

    …ional

Based off discussion https://discourse.ros.org/t/optional-fields-in-message/991/16
As per [REP-2000](https://www.ros.org/reps/rep-2000.html), versions
Galactic+ have minimum language requirements of C++17.
This commit begins re-discussions on supporting std::optional through
msg types of BoundedSequence, max size 1. `type[<=1]`.

Signed-off-by: JWCS <sauve031@umn.edu>
    @JWCS
    JWCS committed Apr 7, 2023
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