8bb54b04ef
FYI: find ortools \( -type d -name .git -prune \) -o -type f -print0 | xargs -0 sed -i 's/\(Copyright 2010\)-2018/\1-2021/g'
237 lines
9.0 KiB
C++
237 lines
9.0 KiB
C++
// Copyright 2010-2021 Google LLC
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This file provides the StrongVector container that wraps around the STL
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// std::vector.
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// The wrapper restricts indexing to a pre-specified type-safe integer type or
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// IntType (see int_type.h). It prevents accidental indexing
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// by different "logical" integer-like types (e.g. another IntType) or native
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// integer types. The wrapper is useful as C++ and the standard template
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// library allows the user to mix "logical" integral indices that might have a
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// different role.
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//
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// The container can only be indexed by an instance of an IntType class, which
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// can be declared as:
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//
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// DEFINE_INT_TYPE(IntTypeName, IntTypeValueType);
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//
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// where IntTypeName is the desired name for the "logical" integer-like type
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// and the ValueType is a supported native integer type such as int or
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// uint64_t (see int_type.h for details).
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//
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// The wrapper exposes all public methods of STL vector and behaves mostly as
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// pass-through. The only method modified to ensure type-safety is the operator
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// [] and the at() method.
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//
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// EXAMPLES --------------------------------------------------------------------
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//
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// DEFINE_INT_TYPE(PhysicalChildIndex, int32);
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// absl::StrongVector<PhysicalChildIndex, ChildStats*> vec;
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//
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// PhysicalChildIndex physical_index;
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// vec[physical_index] = ...; <-- index type match: compiles properly.
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// vec.at(physical_index) = ...; <-- index type match: compiles properly.
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//
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// int32 physical_index;
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// vec[physical_index] = ...; <-- fails to compile.
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// vec.at(physical_index) = ...; <-- fails to compile.
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//
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// DEFINE_INT_TYPE(LogicalChildIndex, int32);
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// int32 logical_index;
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// vec[logical_index] = ...; <-- fails to compile.
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// vec.at(logical_index) = ...; <-- fails to compile.
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//
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// NB: Iterator arithmetic is not allowed as the iterators are not wrapped
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// themselves. Therefore, the following caveat is possible:
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// *(vec.begin() + 0) = ...;
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#ifndef OR_TOOLS_BASE_STRONG_VECTOR_H_
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#define OR_TOOLS_BASE_STRONG_VECTOR_H_
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#include <stddef.h>
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#include <initializer_list>
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#include <string>
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#include <type_traits>
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#include <utility>
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#include <vector>
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#include "ortools/base/int_type.h"
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#include "ortools/base/macros.h"
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namespace absl {
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// STL vector ------------------------------------------------------------------
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template <typename IntType, typename T, typename Alloc = std::allocator<T> >
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class StrongVector {
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public:
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typedef IntType IndexType;
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typedef std::vector<T, Alloc> ParentType;
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typedef typename ParentType::size_type size_type;
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typedef typename ParentType::allocator_type allocator_type;
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typedef typename ParentType::value_type value_type;
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typedef typename ParentType::difference_type difference_type;
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typedef typename ParentType::reference reference;
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typedef typename ParentType::const_reference const_reference;
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typedef typename ParentType::pointer pointer;
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typedef typename ParentType::const_pointer const_pointer;
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typedef typename ParentType::iterator iterator;
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typedef typename ParentType::const_iterator const_iterator;
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typedef typename ParentType::reverse_iterator reverse_iterator;
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typedef typename ParentType::const_reverse_iterator const_reverse_iterator;
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public:
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StrongVector() {}
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explicit StrongVector(const allocator_type& a) : v_(a) {}
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explicit StrongVector(size_type n) : v_(n) {}
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StrongVector(size_type n, const value_type& v,
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const allocator_type& a = allocator_type())
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: v_(n, v, a) {}
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StrongVector(
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std::initializer_list<value_type> il) // NOLINT(runtime/explicit)
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: v_(il) {}
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template <typename InputIteratorType>
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StrongVector(InputIteratorType first, InputIteratorType last,
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const allocator_type& a = allocator_type())
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: v_(first, last, a) {}
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// -- Accessors --------------------------------------------------------------
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// This const accessor is useful in defining the comparison operators below.
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const ParentType& get() const { return v_; }
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// The mutable accessor is useful when using auxiliar methods relying on
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// vector parameters such as JoinUsing(), SplitStringUsing(), etc. Methods
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// relying solely on iterators (e.g. STLDeleteElements) should work just fine
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// without the need for mutable_get(). NB: It should be used only in this
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// case and thus should not be abused to index the underlying vector without
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// the appropriate IntType.
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ParentType* mutable_get() { return &v_; }
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// -- Modified methods -------------------------------------------------------
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reference operator[](IndexType i) { return v_[Value(i)]; }
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const_reference operator[](IndexType i) const { return v_[Value(i)]; }
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reference at(IndexType i) { return v_.at(Value(i)); }
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const_reference at(IndexType i) const { return v_.at(Value(i)); }
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// -- Pass-through methods to STL vector -------------------------------------
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void assign(size_type n, const value_type& val) { v_.assign(n, val); }
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template <typename InputIt>
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void assign(InputIt f, InputIt l) {
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v_.assign(f, l);
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}
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void assign(std::initializer_list<value_type> ilist) { v_.assign(ilist); }
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iterator begin() { return v_.begin(); }
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const_iterator begin() const { return v_.begin(); }
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iterator end() { return v_.end(); }
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const_iterator end() const { return v_.end(); }
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reverse_iterator rbegin() { return v_.rbegin(); }
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const_reverse_iterator rbegin() const { return v_.rbegin(); }
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reverse_iterator rend() { return v_.rend(); }
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const_reverse_iterator rend() const { return v_.rend(); }
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size_type size() const { return v_.size(); }
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size_type max_size() const { return v_.max_size(); }
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void resize(size_type new_size) { v_.resize(new_size); }
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void resize(size_type new_size, const value_type& x) {
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v_.resize(new_size, x);
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}
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size_type capacity() const { return v_.capacity(); }
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bool empty() const { return v_.empty(); }
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void reserve(size_type n) { v_.reserve(n); }
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void push_back(const value_type& x) { v_.push_back(x); }
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void push_back(value_type&& x) { v_.push_back(std::move(x)); } // NOLINT
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template <typename... Args>
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void emplace_back(Args&&... args) {
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v_.emplace_back(std::forward<Args>(args)...);
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}
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template <typename... Args>
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iterator emplace(const_iterator pos, Args&&... args) {
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return v_.emplace(pos, std::forward<Args>(args)...);
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}
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void pop_back() { v_.pop_back(); }
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void swap(StrongVector& x) { v_.swap(x.v_); }
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void clear() { v_.clear(); }
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reference front() { return v_.front(); }
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const_reference front() const { return v_.front(); }
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reference back() { return v_.back(); }
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const_reference back() const { return v_.back(); }
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pointer data() { return v_.data(); }
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const_pointer data() const { return v_.data(); }
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iterator erase(const_iterator pos) { return v_.erase(pos); }
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iterator erase(const_iterator first, const_iterator last) {
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return v_.erase(first, last);
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}
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iterator insert(const_iterator pos, const value_type& x) {
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return v_.insert(pos, x);
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}
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iterator insert(const_iterator pos, value_type&& x) { // NOLINT
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return v_.insert(pos, std::move(x));
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}
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iterator insert(const_iterator pos, size_type n, const value_type& x) {
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return v_.insert(pos, n, x);
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}
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template <typename IIt>
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iterator insert(const_iterator pos, IIt first, IIt last) {
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return v_.insert(pos, first, last);
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}
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iterator insert(const_iterator pos, std::initializer_list<value_type> ilist) {
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return v_.insert(pos, ilist);
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}
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friend bool operator==(const StrongVector& x, const StrongVector& y) {
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return x.get() == y.get();
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}
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friend bool operator!=(const StrongVector& x, const StrongVector& y) {
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return x.get() != y.get();
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}
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friend bool operator<(const StrongVector& x, const StrongVector& y) {
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return x.get() < y.get();
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}
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friend bool operator>(const StrongVector& x, const StrongVector& y) {
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return x.get() > y.get();
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}
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friend bool operator<=(const StrongVector& x, const StrongVector& y) {
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return x.get() <= y.get();
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}
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friend bool operator>=(const StrongVector& x, const StrongVector& y) {
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return x.get() >= y.get();
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}
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friend void swap(StrongVector& x, StrongVector& y) { x.swap(y); }
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template <typename H>
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friend H AbslHashValue(H h, const StrongVector& v) {
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return H::combine(std::move(h), v.v_);
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}
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private:
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static size_type Value(IndexType i) { return i.template value<size_type>(); }
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ParentType v_;
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COMPILE_ASSERT(std::is_integral<typename IndexType::ValueType>::value,
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int_type_indexed_vector_must_have_integral_index);
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};
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} // namespace absl
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#endif // OR_TOOLS_BASE_STRONG_VECTOR_H_
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