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#pragma once
#include <algorithm>
#include <array>
#include <cstdint>
#include <span>
#include <utility>
#include <vector>
template<typename T, typename E>
concept SequentialCollection = requires(T c) {
{
c.size()
} -> std::integral;
{
c.data()
} -> std::same_as<const E *>;
};
template<typename T>
concept IterableCollection = std::is_same_v<decltype(std::declval<T>().begin()), decltype(std::declval<T>().end())>;
template<typename T, std::size_t first, std::size_t second>
[[nodiscard]] constexpr std::array<T, first + second>
operator+(const std::array<T, first> & a, const std::array<T, second> & b)
{
std::array<T, first + second> r;
auto out = r.begin();
out = std::copy(a.begin(), a.end(), out);
std::copy(b.begin(), b.end(), out);
return r;
}
template<typename T, typename V, std::size_t first, std::size_t second>
[[nodiscard]] constexpr std::array<std::pair<T, V>, first * second>
operator*(const std::array<T, first> & a, const std::array<V, second> & b)
{
std::array<std::pair<T, V>, first * second> r;
auto out = r.begin();
for (const auto & ae : a) {
for (const auto & be : b) {
*out++ = {ae, be};
}
}
return r;
}
template<typename T, std::size_t N>
[[nodiscard]] constexpr auto
operator*(const std::array<T, N> & in, auto && f)
{
std::array<decltype(f(in[0])), N> out;
for (auto outitr = out.begin(); const auto & v : in) {
*outitr++ = f(v);
}
return out;
}
constexpr auto &
operator*=(IterableCollection auto & in, auto && f)
{
for (auto & v : in) {
f(v);
}
return in;
}
template<template<typename...> typename C, typename... T>
requires IterableCollection<C<T...>>
[[nodiscard]] constexpr auto
operator*(const C<T...> & in, auto && f)
{
C<decltype(f(*in.begin()))> out;
if constexpr (requires { out.reserve(in.size()); }) {
out.reserve(in.size());
}
std::transform(in.begin(), in.end(), std::inserter(out, out.end()), f);
return out;
}
template<typename T, std::size_t N>
[[nodiscard]] constexpr auto
operator*(const std::span<T, N> in, auto && f)
{
std::array<decltype(f(std::declval<T>())), N> out;
std::transform(in.begin(), in.end(), out.begin(), f);
return out;
}
template<typename T>
[[nodiscard]] constexpr auto
operator*(const std::span<T, std::dynamic_extent> in, auto && f)
{
std::vector<decltype(f(std::declval<T>()))> out;
out.reserve(in.size());
std::transform(in.begin(), in.end(), std::inserter(out, out.end()), f);
return out;
}
template<typename... T>
constexpr auto &
operator+=(std::vector<T...> & in, std::vector<T...> && src)
{
in.reserve(in.size() + src.size());
std::move(src.begin(), src.end(), std::back_inserter(in));
return in;
}
template<typename... T, typename Vn>
[[nodiscard]] constexpr auto
operator+(const std::vector<T...> & in, Vn && vn)
{
auto out(in);
out.emplace_back(std::forward<Vn>(vn));
return out;
}
template<template<typename> typename Direction = std::plus, typename T = unsigned int>
[[nodiscard]] static auto
vectorOfN(std::integral auto N, T start = {}, T step = 1)
{
std::vector<T> v;
v.resize(N);
std::generate_n(v.begin(), N, [&start, step, adj = Direction {}]() {
return std::exchange(start, adj(start, step));
});
return v;
}
template<template<typename...> typename Rtn = std::vector, IterableCollection In>
[[nodiscard]] auto
materializeRange(In && in)
{
return Rtn(in.begin(), in.end());
}
template<template<typename...> typename Rtn = std::vector, typename In>
[[nodiscard]] auto
materializeRange(const std::pair<In, In> & in)
{
return Rtn(in.first, in.second);
}
template<typename T> struct pair_range {
constexpr auto &
begin() const noexcept
{
return pair.first;
}
constexpr auto &
end() const noexcept
{
return pair.second;
}
const std::pair<T, T> & pair;
};
template<typename T> pair_range(std::pair<T, T>) -> pair_range<T>;
template<typename iter> struct stripiter {
[[nodiscard]] constexpr bool
operator!=(const stripiter & other) const
{
return current != other.current;
}
[[nodiscard]] constexpr bool
operator==(const stripiter & other) const
{
return current == other.current;
}
constexpr stripiter &
operator++()
{
++current;
off = 1 - off;
return *this;
}
constexpr stripiter &
operator--()
{
--current;
off = 1 - off;
return *this;
}
constexpr auto
operator-(const stripiter & other) const
{
return current - other.current;
}
constexpr auto
operator*() const
{
return std::tie(*(current - (2 - off)), *(current - off - 1), *current);
}
iter current;
uint8_t off {};
};
template<typename T> struct std::iterator_traits<stripiter<T>> : std::iterator_traits<T> { };
constexpr auto
strip_begin(IterableCollection auto & cont)
{
return stripiter {cont.begin() + 2};
}
constexpr auto
strip_end(IterableCollection auto & cont)
{
return stripiter {cont.end()};
}
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