Add missing front() and back() to Functional::vector_of_const_

add the missing front() and back() as addition to the already existing operator[](...) and at(...)

@tnanut: FYI

added 1 commit

• 0835696a - Add missing front() and back() to Functional::vector_of_const_

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approved this merge request

changed milestone to %v36r5

added lhcb-gaudi-head label

assigned to @clemenci

• [2022-03-24 00:04] Validation started with lhcb-gaudi-head#3196
• [2022-03-24 00:34] Validation started with lhcb-run2-gaudi-head#295
• [2022-03-25 00:06] Validation started with lhcb-gaudi-head#3197
• [2022-03-25 00:39] Validation started with lhcb-run2-gaudi-head#296

merged

mentioned in commit a20ab773

mentioned in commit lhcb/LHCb@0ba20ea5

mentioned in commit lhcb/LHCb@ef3bd759