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This patch introduces the internal helper type _IotaArray to simplify defining a pack of indices via a structured binding declaration: constexpr auto [...__is] = _IotaArray<N>; _IotaArray is a C-array for lowest overhead in terms of template instantiations. Non-GCC compilers that do not implement __integer_pack have a slightly higher overhead. libstdc++-v3/ChangeLog: * include/bits/utility.h (_IotaArray): Define. * testsuite/ext/iotaarray.cc: New test. Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
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