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Romain Vimont authored Nov 20, 2018 and Thomas Guillem committed Nov 23, 2018

Like unique_ptr, make the operator bool() explicit, so that it is only
called implicitly when the value may be "contextually converted to bool"
(if, while, etc.).
Suggested-by: Filip Roséen <filip@atch.se>
Signed-off-by: Thomas Guillem <thomas@gllm.fr>