tuple_tools.h

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// g2o - General Graph Optimization
// Copyright (C) 2011 R. Kuemmerle, G. Grisetti, W. Burgard
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
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//
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//   this list of conditions and the following disclaimer.
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#include <tuple>
#include <type_traits>
#include <utility>
 
namespace g2o {
 
template <typename F, typename T, std::size_t... I>
void tuple_apply_i_(F&& f, T& t, int i, std::index_sequence<I...>) {
  (..., (I == i ? f(std::get<I>(t)) : void()));
}
 
template <typename F, typename T>
void tuple_apply_i(F&& f, T& t, int i) {
  tuple_apply_i_(
      f, t, i, std::make_index_sequence<std::tuple_size_v<std::decay_t<T>>>());
}
 
}  // namespace g2o