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authorStanislaw Halik <sthalik@misaki.pl>2018-01-18 12:23:53 +0100
committerStanislaw Halik <sthalik@misaki.pl>2018-01-18 12:34:58 +0100
commit11ef6b48676c52a42a81f1f5ee021cb37e728800 (patch)
treedf11e6e50554dcf8c075d91d56b723ec22dc867a /compat
parent682eaa51a76605c028a844acb1cfe7dbfa0ab945 (diff)
compat: move powerset.hpp to qxt-mini/
Diffstat (limited to 'compat')
-rw-r--r--compat/powerset.hpp102
1 files changed, 0 insertions, 102 deletions
diff --git a/compat/powerset.hpp b/compat/powerset.hpp
deleted file mode 100644
index fa49307e..00000000
--- a/compat/powerset.hpp
+++ /dev/null
@@ -1,102 +0,0 @@
-#pragma once
-
-#include "util.hpp"
-
-#include <type_traits>
-#include <cinttypes>
-#include <vector>
-#include <array>
-#include <iterator>
-
-#include <QString>
-#include <QVariant>
-
-template<typename t, int M, typename size_type_ = std::uintptr_t>
-struct powerset final
-{
- static_assert(is_integral_v<size_type_>, "");
-
- using size_type = size_type_;
-
- static_assert(M > 0, "");
- static_assert(M < sizeof(size_type[8]), "");
- static_assert((is_unsigned_v<size_type>) || M < sizeof(size_type)*8 - 1, "");
-
- using N = std::integral_constant<size_type, (size_type(1) << size_type(M))-1>;
- static_assert((N::value & (N::value + 1)) == 0, "");
-
- using set_type = std::vector<t>;
- using sets_type = std::array<set_type, N::value>;
- using element_type = t;
- using element_count = std::integral_constant<size_type, N::value>;
- using self_type = powerset<t, M>;
-
- operator const sets_type&() const { return sets_; }
- operator sets_type&() { return sets_; }
-
- const sets_type& sets() const { return sets_; }
- sets_type& sets() { return sets_; }
-
- set_type& operator[](unsigned k) { return sets_[k]; }
- const set_type& operator[](unsigned k) const { return sets_[k]; }
-
- const set_type& elements() const { return elements_; }
- set_type& elements() { return elements_; }
-
- template<typename = void>
- operator QString() const
- {
- QString str;
- unsigned k = 0;
- for (const auto& set : sets_)
- {
- str.append(QStringLiteral("#%1: ").arg(++k));
- for (const auto& x : set)
- str.append(QStringLiteral("%1 ").arg(x));
- str.append('\n');
- }
- return str.mid(0, str.size() - 1);
- }
-
- powerset() {}
-
-private:
- sets_type sets_;
- set_type elements_;
-};
-
-template<typename t, typename... xs>
-auto make_powerset(const t& arg, const xs&... args)
-{
- using cnt = std::integral_constant<std::uintptr_t, sizeof...(xs)+1>;
- using p = powerset<t, cnt::value>;
- using len = typename p::element_count;
- using vec = typename p::set_type;
- using size_type = typename p::size_type;
-
- p ret;
- vec v;
- v.reserve(len());
-
- const typename p::set_type ts {{arg, static_cast<t>(args)...}};
-
- ret.elements() = std::vector<t>(std::begin(ts), std::end(ts));
-
- // no nullary set
- for (size_type i = 0; i < len(); i++)
- {
- v.clear();
- size_type k = 1;
- for (const t& x : ts)
- {
- if ((i+1) & k)
- v.push_back(std::move(x));
- k <<= 1;
- }
-
- ret[i] = vec(std::begin(v), std::end(v));
- ret[i].shrink_to_fit();
- }
-
- return ret;
-}