Now that we're using C++-14, replace the manual implementation of
std::integer_sequence with std::index_sequence, a specialization of
std::integer_sequence with the integer type equal to std::size_t. The
template parameter S that denotes a sequence is replaced with I to align
with the usage examples of cppreference.com.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
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