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cd52a7a381
Apparently, the style needs to be agreed upon first. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240390 91177308-0d34-0410-b5e6-96231b3b80d8
423 lines
14 KiB
C++
423 lines
14 KiB
C++
//===- llvm/ADT/STLExtras.h - Useful STL related functions ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains some templates that are useful if you are working with the
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// STL at all.
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//
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// No library is required when using these functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_STLEXTRAS_H
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#define LLVM_ADT_STLEXTRAS_H
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#include "llvm/Support/Compiler.h"
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#include <algorithm> // for std::all_of
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#include <cassert>
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#include <cstddef> // for std::size_t
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#include <cstdlib> // for qsort
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#include <functional>
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#include <iterator>
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#include <memory>
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#include <utility> // for std::pair
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// Extra additions to <functional>
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//===----------------------------------------------------------------------===//
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template<class Ty>
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struct identity : public std::unary_function<Ty, Ty> {
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Ty &operator()(Ty &self) const {
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return self;
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}
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const Ty &operator()(const Ty &self) const {
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return self;
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}
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};
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template<class Ty>
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struct less_ptr : public std::binary_function<Ty, Ty, bool> {
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bool operator()(const Ty* left, const Ty* right) const {
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return *left < *right;
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}
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};
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template<class Ty>
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struct greater_ptr : public std::binary_function<Ty, Ty, bool> {
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bool operator()(const Ty* left, const Ty* right) const {
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return *right < *left;
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}
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};
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/// An efficient, type-erasing, non-owning reference to a callable. This is
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/// intended for use as the type of a function parameter that is not used
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/// after the function in question returns.
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///
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/// This class does not own the callable, so it is not in general safe to store
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/// a function_ref.
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template<typename Fn> class function_ref;
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template<typename Ret, typename ...Params>
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class function_ref<Ret(Params...)> {
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Ret (*callback)(intptr_t callable, Params ...params);
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intptr_t callable;
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template<typename Callable>
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static Ret callback_fn(intptr_t callable, Params ...params) {
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return (*reinterpret_cast<Callable*>(callable))(
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std::forward<Params>(params)...);
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}
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public:
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template <typename Callable>
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function_ref(Callable &&callable,
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typename std::enable_if<
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!std::is_same<typename std::remove_reference<Callable>::type,
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function_ref>::value>::type * = nullptr)
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: callback(callback_fn<typename std::remove_reference<Callable>::type>),
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callable(reinterpret_cast<intptr_t>(&callable)) {}
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Ret operator()(Params ...params) const {
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return callback(callable, std::forward<Params>(params)...);
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}
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};
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// deleter - Very very very simple method that is used to invoke operator
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// delete on something. It is used like this:
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//
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// for_each(V.begin(), B.end(), deleter<Interval>);
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//
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template <class T>
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inline void deleter(T *Ptr) {
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delete Ptr;
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}
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//===----------------------------------------------------------------------===//
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// Extra additions to <iterator>
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//===----------------------------------------------------------------------===//
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// mapped_iterator - This is a simple iterator adapter that causes a function to
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// be dereferenced whenever operator* is invoked on the iterator.
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//
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template <class RootIt, class UnaryFunc>
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class mapped_iterator {
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RootIt current;
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UnaryFunc Fn;
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public:
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typedef typename std::iterator_traits<RootIt>::iterator_category
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iterator_category;
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typedef typename std::iterator_traits<RootIt>::difference_type
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difference_type;
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typedef typename UnaryFunc::result_type value_type;
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typedef void pointer;
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//typedef typename UnaryFunc::result_type *pointer;
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typedef void reference; // Can't modify value returned by fn
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typedef RootIt iterator_type;
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inline const RootIt &getCurrent() const { return current; }
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inline const UnaryFunc &getFunc() const { return Fn; }
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inline explicit mapped_iterator(const RootIt &I, UnaryFunc F)
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: current(I), Fn(F) {}
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inline value_type operator*() const { // All this work to do this
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return Fn(*current); // little change
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}
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mapped_iterator &operator++() {
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++current;
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return *this;
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}
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mapped_iterator &operator--() {
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--current;
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return *this;
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}
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mapped_iterator operator++(int) {
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mapped_iterator __tmp = *this;
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++current;
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return __tmp;
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}
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mapped_iterator operator--(int) {
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mapped_iterator __tmp = *this;
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--current;
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return __tmp;
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}
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mapped_iterator operator+(difference_type n) const {
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return mapped_iterator(current + n, Fn);
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}
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mapped_iterator &operator+=(difference_type n) {
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current += n;
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return *this;
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}
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mapped_iterator operator-(difference_type n) const {
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return mapped_iterator(current - n, Fn);
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}
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mapped_iterator &operator-=(difference_type n) {
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current -= n;
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return *this;
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}
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reference operator[](difference_type n) const { return *(*this + n); }
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bool operator!=(const mapped_iterator &X) const { return !operator==(X); }
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bool operator==(const mapped_iterator &X) const {
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return current == X.current;
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}
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bool operator<(const mapped_iterator &X) const { return current < X.current; }
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difference_type operator-(const mapped_iterator &X) const {
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return current - X.current;
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}
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};
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template <class Iterator, class Func>
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inline mapped_iterator<Iterator, Func>
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operator+(typename mapped_iterator<Iterator, Func>::difference_type N,
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const mapped_iterator<Iterator, Func> &X) {
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return mapped_iterator<Iterator, Func>(X.getCurrent() - N, X.getFunc());
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}
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// map_iterator - Provide a convenient way to create mapped_iterators, just like
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// make_pair is useful for creating pairs...
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//
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template <class ItTy, class FuncTy>
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inline mapped_iterator<ItTy, FuncTy> map_iterator(const ItTy &I, FuncTy F) {
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return mapped_iterator<ItTy, FuncTy>(I, F);
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}
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//===----------------------------------------------------------------------===//
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// Extra additions to <utility>
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//===----------------------------------------------------------------------===//
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/// \brief Function object to check whether the first component of a std::pair
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/// compares less than the first component of another std::pair.
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struct less_first {
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template <typename T> bool operator()(const T &lhs, const T &rhs) const {
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return lhs.first < rhs.first;
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}
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};
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/// \brief Function object to check whether the second component of a std::pair
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/// compares less than the second component of another std::pair.
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struct less_second {
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template <typename T> bool operator()(const T &lhs, const T &rhs) const {
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return lhs.second < rhs.second;
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}
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};
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// A subset of N3658. More stuff can be added as-needed.
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/// \brief Represents a compile-time sequence of integers.
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template <class T, T... I> struct integer_sequence {
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typedef T value_type;
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static LLVM_CONSTEXPR size_t size() { return sizeof...(I); }
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};
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/// \brief Alias for the common case of a sequence of size_ts.
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template <size_t... I>
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struct index_sequence : integer_sequence<std::size_t, I...> {};
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template <std::size_t N, std::size_t... I>
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struct build_index_impl : build_index_impl<N - 1, N - 1, I...> {};
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template <std::size_t... I>
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struct build_index_impl<0, I...> : index_sequence<I...> {};
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/// \brief Creates a compile-time integer sequence for a parameter pack.
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template <class... Ts>
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struct index_sequence_for : build_index_impl<sizeof...(Ts)> {};
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//===----------------------------------------------------------------------===//
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// Extra additions for arrays
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//===----------------------------------------------------------------------===//
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/// Find the length of an array.
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template <class T, std::size_t N>
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LLVM_CONSTEXPR inline size_t array_lengthof(T (&)[N]) {
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return N;
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}
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/// Adapt std::less<T> for array_pod_sort.
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template<typename T>
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inline int array_pod_sort_comparator(const void *P1, const void *P2) {
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if (std::less<T>()(*reinterpret_cast<const T*>(P1),
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*reinterpret_cast<const T*>(P2)))
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return -1;
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if (std::less<T>()(*reinterpret_cast<const T*>(P2),
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*reinterpret_cast<const T*>(P1)))
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return 1;
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return 0;
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}
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/// get_array_pod_sort_comparator - This is an internal helper function used to
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/// get type deduction of T right.
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template<typename T>
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inline int (*get_array_pod_sort_comparator(const T &))
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(const void*, const void*) {
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return array_pod_sort_comparator<T>;
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}
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/// array_pod_sort - This sorts an array with the specified start and end
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/// extent. This is just like std::sort, except that it calls qsort instead of
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/// using an inlined template. qsort is slightly slower than std::sort, but
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/// most sorts are not performance critical in LLVM and std::sort has to be
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/// template instantiated for each type, leading to significant measured code
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/// bloat. This function should generally be used instead of std::sort where
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/// possible.
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///
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/// This function assumes that you have simple POD-like types that can be
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/// compared with std::less and can be moved with memcpy. If this isn't true,
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/// you should use std::sort.
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///
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/// NOTE: If qsort_r were portable, we could allow a custom comparator and
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/// default to std::less.
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template<class IteratorTy>
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inline void array_pod_sort(IteratorTy Start, IteratorTy End) {
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// Don't inefficiently call qsort with one element or trigger undefined
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// behavior with an empty sequence.
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auto NElts = End - Start;
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if (NElts <= 1) return;
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qsort(&*Start, NElts, sizeof(*Start), get_array_pod_sort_comparator(*Start));
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}
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template <class IteratorTy>
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inline void array_pod_sort(
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IteratorTy Start, IteratorTy End,
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int (*Compare)(
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const typename std::iterator_traits<IteratorTy>::value_type *,
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const typename std::iterator_traits<IteratorTy>::value_type *)) {
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// Don't inefficiently call qsort with one element or trigger undefined
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// behavior with an empty sequence.
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auto NElts = End - Start;
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if (NElts <= 1) return;
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qsort(&*Start, NElts, sizeof(*Start),
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reinterpret_cast<int (*)(const void *, const void *)>(Compare));
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}
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//===----------------------------------------------------------------------===//
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// Extra additions to <algorithm>
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//===----------------------------------------------------------------------===//
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/// For a container of pointers, deletes the pointers and then clears the
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/// container.
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template<typename Container>
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void DeleteContainerPointers(Container &C) {
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for (typename Container::iterator I = C.begin(), E = C.end(); I != E; ++I)
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delete *I;
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C.clear();
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}
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/// In a container of pairs (usually a map) whose second element is a pointer,
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/// deletes the second elements and then clears the container.
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template<typename Container>
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void DeleteContainerSeconds(Container &C) {
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for (typename Container::iterator I = C.begin(), E = C.end(); I != E; ++I)
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delete I->second;
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C.clear();
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}
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/// Provide wrappers to std::all_of which take ranges instead of having to pass
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/// being/end explicitly.
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template<typename R, class UnaryPredicate>
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bool all_of(R &&Range, UnaryPredicate &&P) {
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return std::all_of(Range.begin(), Range.end(),
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std::forward<UnaryPredicate>(P));
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}
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//===----------------------------------------------------------------------===//
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// Extra additions to <memory>
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//===----------------------------------------------------------------------===//
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// Implement make_unique according to N3656.
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/// \brief Constructs a `new T()` with the given args and returns a
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/// `unique_ptr<T>` which owns the object.
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///
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/// Example:
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///
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/// auto p = make_unique<int>();
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/// auto p = make_unique<std::tuple<int, int>>(0, 1);
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template <class T, class... Args>
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typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type
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make_unique(Args &&... args) {
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return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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/// \brief Constructs a `new T[n]` with the given args and returns a
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/// `unique_ptr<T[]>` which owns the object.
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///
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/// \param n size of the new array.
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///
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/// Example:
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///
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/// auto p = make_unique<int[]>(2); // value-initializes the array with 0's.
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template <class T>
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typename std::enable_if<std::is_array<T>::value && std::extent<T>::value == 0,
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std::unique_ptr<T>>::type
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make_unique(size_t n) {
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return std::unique_ptr<T>(new typename std::remove_extent<T>::type[n]());
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}
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/// This function isn't used and is only here to provide better compile errors.
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template <class T, class... Args>
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typename std::enable_if<std::extent<T>::value != 0>::type
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make_unique(Args &&...) = delete;
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struct FreeDeleter {
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void operator()(void* v) {
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::free(v);
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}
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};
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template<typename First, typename Second>
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struct pair_hash {
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size_t operator()(const std::pair<First, Second> &P) const {
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return std::hash<First>()(P.first) * 31 + std::hash<Second>()(P.second);
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}
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};
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/// A functor like C++14's std::less<void> in its absence.
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struct less {
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template <typename A, typename B> bool operator()(A &&a, B &&b) const {
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return std::forward<A>(a) < std::forward<B>(b);
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}
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};
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/// A functor like C++14's std::equal<void> in its absence.
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struct equal {
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template <typename A, typename B> bool operator()(A &&a, B &&b) const {
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return std::forward<A>(a) == std::forward<B>(b);
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}
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};
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/// Binary functor that adapts to any other binary functor after dereferencing
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/// operands.
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template <typename T> struct deref {
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T func;
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// Could be further improved to cope with non-derivable functors and
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// non-binary functors (should be a variadic template member function
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// operator()).
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template <typename A, typename B>
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auto operator()(A &lhs, B &rhs) const -> decltype(func(*lhs, *rhs)) {
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assert(lhs);
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assert(rhs);
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return func(*lhs, *rhs);
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}
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};
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} // End llvm namespace
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#endif
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