d875dee1
 Hu Chunming
提交当前使用版本的opencv
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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
//
// Copyright (C) 2018-2019 Intel Corporation
#ifndef OPENCV_GAPI_UTIL_HPP
#define OPENCV_GAPI_UTIL_HPP
#include <tuple>
// \cond HIDDEN_SYMBOLS
// This header file contains some generic utility functions which are
// used in other G-API Public API headers.
//
// PLEASE don't put any stuff here if it is NOT used in public API headers!
namespace cv
{
namespace detail
{
// Recursive integer sequence type, useful for enumerating elements of
// template parameter packs.
template<int... I> struct Seq { using next = Seq<I..., sizeof...(I)>; };
template<int Sz> struct MkSeq { using type = typename MkSeq<Sz-1>::type::next; };
template<> struct MkSeq<0>{ using type = Seq<>; };
// Checks if elements of variadic template satisfy the given Predicate.
// Implemented via tuple, with an interface to accept plain type lists
template<template<class> class, typename, typename...> struct all_satisfy;
template<template<class> class F, typename T, typename... Ts>
struct all_satisfy<F, std::tuple<T, Ts...> >
{
static const constexpr bool value = F<T>::value
&& all_satisfy<F, std::tuple<Ts...> >::value;
};
template<template<class> class F, typename T>
struct all_satisfy<F, std::tuple<T> >
{
static const constexpr bool value = F<T>::value;
};
template<template<class> class F, typename T, typename... Ts>
struct all_satisfy: public all_satisfy<F, std::tuple<T, Ts...> > {};
// Permute given tuple type C with given integer sequence II
// Sequence may be less than tuple C size.
template<class, class> struct permute_tuple;
template<class C, int... IIs>
struct permute_tuple<C, Seq<IIs...> >
{
using type = std::tuple< typename std::tuple_element<IIs, C>::type... >;
};
// Given T..., generates a type sequence of sizeof...(T)-1 elements
// which is T... without its last element
// Implemented via tuple, with an interface to accept plain type lists
template<typename T, typename... Ts> struct all_but_last;
template<typename T, typename... Ts>
struct all_but_last<std::tuple<T, Ts...> >
{
using C = std::tuple<T, Ts...>;
using S = typename MkSeq<std::tuple_size<C>::value - 1>::type;
using type = typename permute_tuple<C, S>::type;
};
template<typename T, typename... Ts>
struct all_but_last: public all_but_last<std::tuple<T, Ts...> > {};
template<typename... Ts>
using all_but_last_t = typename all_but_last<Ts...>::type;
// NB.: This is here because there's no constexpr std::max in C++11
template<std::size_t S0, std::size_t... SS> struct max_of_t
{
static constexpr const std::size_t rest = max_of_t<SS...>::value;
static constexpr const std::size_t value = rest > S0 ? rest : S0;
};
template<std::size_t S> struct max_of_t<S>
{
static constexpr const std::size_t value = S;
};
template <typename...>
struct contains : std::false_type{};
template <typename T1, typename T2, typename... Ts>
struct contains<T1, T2, Ts...> : std::integral_constant<bool, std::is_same<T1, T2>::value ||
contains<T1, Ts...>::value> {};
template<typename T, typename... Types>
struct contains<T, std::tuple<Types...>> : std::integral_constant<bool, contains<T, Types...>::value> {};
template <typename...>
struct all_unique : std::true_type{};
template <typename T1, typename... Ts>
struct all_unique<T1, Ts...> : std::integral_constant<bool, !contains<T1, Ts...>::value &&
all_unique<Ts...>::value> {};
template<typename>
struct tuple_wrap_helper;
template<typename T> struct tuple_wrap_helper
{
using type = std::tuple<T>;
static type get(T&& obj) { return std::make_tuple(std::move(obj)); }
};
template<typename... Objs>
struct tuple_wrap_helper<std::tuple<Objs...>>
{
using type = std::tuple<Objs...>;
static type get(std::tuple<Objs...>&& objs) { return std::forward<std::tuple<Objs...>>(objs); }
};
} // namespace detail
} // namespace cv
// \endcond
#endif // OPENCV_GAPI_UTIL_HPP
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