31 lines
941 B
C++
31 lines
941 B
C++
#ifndef RFL_INTERNAL_VISITTREE_HPP_
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#define RFL_INTERNAL_VISITTREE_HPP_
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namespace rfl {
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namespace internal {
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struct VisitTree {
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/// Evaluates a visitor pattern using a tree-like structure.
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template <int _begin, int _end, class Visitor, class... Args>
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static inline auto visit(const auto& _v,
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const int _i,
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const Args&... _args) {
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static_assert(_end > _begin, "_end needs to be greater than _begin.");
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if constexpr (_end - _begin == 1) {
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return _v.template visit<_begin>(_args...);
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} else {
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constexpr int middle = (_begin + _end) / 2;
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if (_i < middle) {
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return visit<_begin, middle, Visitor>(_v, _i, _args...);
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} else {
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return visit<middle, _end, Visitor>(_v, _i, _args...);
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}
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}
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}
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};
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} // namespace internal
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} // namespace rfl
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#endif
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