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alternate make_index_sequence impl if no boost::mp11

release/4.3a0
Gerry Chen 2021-12-02 23:26:34 -05:00
parent e037fa1bdb
commit d9c8ce2721
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34
gtsam/nonlinear/NonlinearFactor.h
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@ -28,7 +28,41 @@
#include <boost/serialization/base_object.hpp>
#include <boost/assign/list_of.hpp>
#if BOOST_VERSION >= 106600
#include <boost/mp11/integer_sequence.hpp>
#else
namespace boost {
namespace mp11 {
// Adapted from https://stackoverflow.com/a/32223343/9151520
template <size_t... Ints>
struct index_sequence {
using type = index_sequence;
using value_type = size_t;
static constexpr std::size_t size() noexcept { return sizeof...(Ints); }
};
namespace detail {
template <class Sequence1, class Sequence2>
struct _merge_and_renumber;
template <size_t... I1, size_t... I2>
struct _merge_and_renumber<index_sequence<I1...>, index_sequence<I2...> >
: index_sequence<I1..., (sizeof...(I1) + I2)...> {};
} // namespace detail
template <size_t N>
struct make_index_sequence
: detail::_merge_and_renumber<
typename make_index_sequence<N / 2>::type,
typename make_index_sequence<N - N / 2>::type> {};
template <>
struct make_index_sequence<0> : index_sequence<> {};
template <>
struct make_index_sequence<1> : index_sequence<0> {};
template <class... T>
using index_sequence_for = make_index_sequence<sizeof...(T)>;
} // namespace mp11
} // namespace boost
#endif
namespace gtsam {