tree a703bbe3e57d4e4be5b5bde0272db5f6d239a851
parent adb973e4a337c372aa81ca1a4f3bb704068c08b7
author Alex Stewart <alexs.mac@gmail.com> 1590344318 +0100
committer Alex Stewart <alexs.mac@gmail.com> 1590344318 +0100

Replace type aliases deprecated/removed in C++17/C++20 from FixedArray

- Raised as issue #551
- Also adds C++20 to the set of ALLOWED_CXX_STANDARDS, although this
  will require a version of CMake >= 3.12.

Change-Id: I0f13c72e93a35391fd2d18590b4243a329a2322c