taskflow/taskflow/utility/traits.hpp at master · PentaBug/taskflow · GitHub

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#pragma once

#if __has_include(<version>)

# include <version>

#endif

#include <type_traits>

#include <iterator>

#include <iostream>

#include <fstream>

#include <mutex>

#include <stack>

#include <queue>

#include <vector>

#include <algorithm>

#include <memory>

#include <atomic>

#include <thread>

#include <future>

#include <functional>

#include <unordered_map>

#include <unordered_set>

#include <sstream>

#include <list>

#include <numeric>

#include <random>

#include <iomanip>

#include <cassert>

#include <cmath>

#include <array>

#include <string>

#include <variant>

#include <optional>

#include "os.hpp"

namespace tf {

//-----------------------------------------------------------------------------

// Traits

//-----------------------------------------------------------------------------

//// Struct: dependent_false

//template <typename... T>

//struct dependent_false {

// static constexpr bool value = false;

//};

//template <typename... T>

//constexpr auto dependent_false_v = dependent_false<T...>::value;

template<typename> inline constexpr bool dependent_false_v = false;

// ----------------------------------------------------------------------------

// is_pod

//-----------------------------------------------------------------------------

template <typename T>

struct is_pod {

static const bool value = std::is_trivial_v<T> &&

std::is_standard_layout_v<T>;

};

template <typename T>

constexpr bool is_pod_v = is_pod<T>::value;

//-----------------------------------------------------------------------------

// NoInit

//-----------------------------------------------------------------------------

template <typename T>

struct NoInit {

//static_assert(is_pod_v<T>, "NoInit only supports POD type");

// constructor without initialization

NoInit () noexcept {}

// implicit conversion T -> NoInit<T>

constexpr NoInit (T value) noexcept : v{value} {}

// implicit conversion NoInit<T> -> T

constexpr operator T () const noexcept { return v; }

T v;

};

//-----------------------------------------------------------------------------

// Move-On-Copy

//-----------------------------------------------------------------------------

// Struct: MoveOnCopyWrapper

template <typename T>

struct MoC {

MoC(T&& rhs) : object(std::move(rhs)) {}

MoC(const MoC& other) : object(std::move(other.object)) {}

T& get() { return object; }

mutable T object;

};

template <typename T>

auto make_moc(T&& m) {

return MoC<T>(std::forward<T>(m));

}

//-----------------------------------------------------------------------------

// Visitors.

//-----------------------------------------------------------------------------

//// Overloadded.

//template <typename... Ts>

//struct Visitors : Ts... {

// using Ts::operator()... ;

//};

//template <typename... Ts>

//Visitors(Ts...) -> Visitors<Ts...>;

// ----------------------------------------------------------------------------

// std::variant

// ----------------------------------------------------------------------------

template <typename T, typename>

struct get_index;

template <size_t I, typename... Ts>

struct get_index_impl {};

template <size_t I, typename T, typename... Ts>

struct get_index_impl<I, T, T, Ts...> : std::integral_constant<size_t, I>{};

template <size_t I, typename T, typename U, typename... Ts>

struct get_index_impl<I, T, U, Ts...> : get_index_impl<I+1, T, Ts...>{};

template <typename T, typename... Ts>

struct get_index<T, std::variant<Ts...>> : get_index_impl<0, T, Ts...>{};

template <typename T, typename... Ts>

constexpr auto get_index_v = get_index<T, Ts...>::value;

// ----------------------------------------------------------------------------

// unwrap_reference

// ----------------------------------------------------------------------------

template <class T>

struct unwrap_reference { using type = T; };

template <class U>

struct unwrap_reference<std::reference_wrapper<U>> { using type = U&; };

template<class T>

using unwrap_reference_t = typename unwrap_reference<T>::type;

template< class T >

struct unwrap_ref_decay : unwrap_reference<std::decay_t<T>> {};

template<class T>

using unwrap_ref_decay_t = typename unwrap_ref_decay<T>::type;

// ----------------------------------------------------------------------------

// stateful iterators

// ----------------------------------------------------------------------------

// STL-styled iterator

template <typename B, typename E>

struct stateful_iterator {

using TB = std::decay_t<unwrap_ref_decay_t<B>>;

using TE = std::decay_t<unwrap_ref_decay_t<E>>;

static_assert(std::is_same_v<TB, TE>, "decayed iterator types must match");

using type = TB;

};

template <typename B, typename E>

using stateful_iterator_t = typename stateful_iterator<B, E>::type;

// raw integral index

template <typename B, typename E, typename S>

struct stateful_index {

using TB = std::decay_t<unwrap_ref_decay_t<B>>;

using TE = std::decay_t<unwrap_ref_decay_t<E>>;

using TS = std::decay_t<unwrap_ref_decay_t<S>>;

static_assert(

std::is_integral_v<TB>, "decayed beg index must be an integral type"

);

static_assert(

std::is_integral_v<TE>, "decayed end index must be an integral type"

);

static_assert(

std::is_integral_v<TS>, "decayed step must be an integral type"

);

static_assert(

std::is_same_v<TB, TE> && std::is_same_v<TE, TS>,

"decayed index and step types must match"

);

using type = TB;

};

template <typename B, typename E, typename S>

using stateful_index_t = typename stateful_index<B, E, S>::type;

// ----------------------------------------------------------------------------

// visit a tuple with a functor at runtime

// ----------------------------------------------------------------------------

template <typename Func, typename Tuple, size_t N = 0>

void visit_tuple(Func func, Tuple& tup, size_t idx) {

if (N == idx) {

std::invoke(func, std::get<N>(tup));

return;

}

if constexpr (N + 1 < std::tuple_size_v<Tuple>) {

return visit_tuple<Func, Tuple, N + 1>(func, tup, idx);

}

// ----------------------------------------------------------------------------

// unroll loop

// ----------------------------------------------------------------------------

// Template unrolled looping construct.

template<auto beg, auto end, auto step, bool valid = (beg < end)>

struct Unroll {

template<typename F>

static void eval(F f) {

f(beg);

Unroll<beg + step, end, step>::eval(f);

}

};

template<auto beg, auto end, auto step>

struct Unroll<beg, end, step, false> {

template<typename F>

static void eval(F) { }

};

template<auto beg, auto end, auto step, typename F>

void unroll(F f) {

Unroll<beg, end, step>::eval(f);

}

// ----------------------------------------------------------------------------

// make types of variant unique

// ----------------------------------------------------------------------------

template <typename T, typename... Ts>

struct filter_duplicates { using type = T; };

template <template <typename...> class C, typename... Ts, typename U, typename... Us>

struct filter_duplicates<C<Ts...>, U, Us...>

: std::conditional_t<(std::is_same_v<U, Ts> || ...)

, filter_duplicates<C<Ts...>, Us...>

, filter_duplicates<C<Ts..., U>, Us...>> {};

template <typename T>

struct unique_variant;

template <typename... Ts>

struct unique_variant<std::variant<Ts...>> : filter_duplicates<std::variant<>, Ts...> {};

template <typename T>

using unique_variant_t = typename unique_variant<T>::type;

// ----------------------------------------------------------------------------

// check if it is default compare

// ----------------------------------------------------------------------------

template <typename T> struct is_std_compare : std::false_type { };

template <typename T> struct is_std_compare<std::less<T>> : std::true_type { };

template <typename T> struct is_std_compare<std::greater<T>> : std::true_type { };

template <typename T>

constexpr static bool is_std_compare_v = is_std_compare<T>::value;

// ----------------------------------------------------------------------------

// check if all types are the same

// ----------------------------------------------------------------------------

template<bool...>

struct bool_pack;

template<bool... bs>

using all_true = std::is_same<bool_pack<bs..., true>, bool_pack<true, bs...>>;

template <typename T, typename... Ts>

using all_same = all_true<std::is_same_v<T, Ts>...>;

template <typename T, typename... Ts>

constexpr bool all_same_v = all_same<T, Ts...>::value;

} // end of namespace tf. ----------------------------------------------------

taskflow/taskflow/utility/traits.hpp at master · PentaBug/taskflow · GitHub

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