OgreSmallVector.h

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//===- llvm/ADT/SmallVector.h - 'Normally small' vectors --------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License.
// ==============================================================================
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// ==============================================================================
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// Open Source License
//
// Copyright (c) 2003-2010 University of Illinois at Urbana-Champaign.
// All rights reserved.
//
// Developed by:
//
// LLVM Team
//
// University of Illinois at Urbana-Champaign
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// this software and associated documentation files (the "Software"), to deal with
// the Software without restriction, including without limitation the rights to
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// this list of conditions and the following disclaimers.
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// this list of conditions and the following disclaimers in the
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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//===----------------------------------------------------------------------===//
//
// This file defines the SmallVector class.
//
//===----------------------------------------------------------------------===//

#ifndef __SmallVector_H
#define __SmallVector_H

#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <iterator>
#include <memory>

#ifdef _MSC_VER
namespace std {
#if _MSC_VER <= 1310
    // Work around flawed VC++ implementation of std::uninitialized_copy.  Define
    // additional overloads so that elements with pointer types are recognized as
    // scalars and not objects, causing bizarre type conversion errors.
    template<class T1, class T2>
    inline _Scalar_ptr_iterator_tag _Ptr_cat(T1 **, T2 **) {
        _Scalar_ptr_iterator_tag _Cat;
        return _Cat;
    }
    
    template<class T1, class T2>
    inline _Scalar_ptr_iterator_tag _Ptr_cat(T1* const *, T2 **) {
        _Scalar_ptr_iterator_tag _Cat;
        return _Cat;
    }
#else
    // FIXME: It is not clear if the problem is fixed in VS 2005.  What is clear
    // is that the above hack won't work if it wasn't fixed.
#endif
}
#endif

namespace Ogre {
    
    // some type traits
    template <typename T>   struct isPodLike { static const bool value = false; };
    
    template <>             struct isPodLike<bool>              { static const bool value = true; };
    template <>             struct isPodLike<char>              { static const bool value = true; };
    template <>             struct isPodLike<signed char>       { static const bool value = true; };
    template <>             struct isPodLike<unsigned char>     { static const bool value = true; };
    template <>             struct isPodLike<int>               { static const bool value = true; };
    template <>             struct isPodLike<unsigned>          { static const bool value = true; };
    template <>             struct isPodLike<short>             { static const bool value = true; };
    template <>             struct isPodLike<unsigned short>    { static const bool value = true; };
    template <>             struct isPodLike<long>              { static const bool value = true; };
    template <>             struct isPodLike<unsigned long>     { static const bool value = true; };
    template <>             struct isPodLike<float>             { static const bool value = true; };
    template <>             struct isPodLike<double>            { static const bool value = true; };
    template <typename T>   struct isPodLike<T*>                { static const bool value = true; };
    
    template<typename T, typename U>
    struct isPodLike<std::pair<T, U> > { static const bool value = isPodLike<T>::value & isPodLike<U>::value; };

    class SmallVectorBase {
    protected:
        void *BeginX, *EndX, *CapacityX;
        
        // Allocate raw space for N elements of type T.  If T has a ctor or dtor, we
        // don't want it to be automatically run, so we need to represent the space as
        // something else.  An array of char would work great, but might not be
  // aligned sufficiently.  Instead we use some number of union instances for
  // the space, which guarantee maximal alignment.
  union U {
                double D;
                long double LD;
                long long L;
                void *P;
        } FirstEl;
        // Space after 'FirstEl' is clobbered, do not add any instance vars after it.
        
    protected:
        SmallVectorBase(size_t Size)
        : BeginX(&FirstEl), EndX(&FirstEl), CapacityX((char*)&FirstEl+Size) {}
        
        bool isSmall() const {
            return BeginX == static_cast<const void*>(&FirstEl);
        }
        
        size_t size_in_bytes() const {
            return size_t((char*)EndX - (char*)BeginX);
        }
        
        size_t capacity_in_bytes() const {
            return size_t((char*)CapacityX - (char*)BeginX);
        }
        
        void grow_pod(size_t MinSizeInBytes, size_t TSize);
        
    public:
        bool empty() const { return BeginX == EndX; }
    };
    
    
    template <typename T>
    class SmallVectorTemplateCommon : public SmallVectorBase {
    protected:
        void setEnd(T *P) { this->EndX = P; }
    public:
        SmallVectorTemplateCommon(size_t Size) : SmallVectorBase(Size) {}
        
        typedef size_t size_type;
        typedef ptrdiff_t difference_type;
        typedef T value_type;
        typedef T *iterator;
        typedef const T *const_iterator;
        
        typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
        typedef std::reverse_iterator<iterator> reverse_iterator;
        
        typedef T &reference;
        typedef const T &const_reference;
        typedef T *pointer;
        typedef const T *const_pointer;
        
        // forward iterator creation methods.
        iterator begin() { return (iterator)this->BeginX; }
        const_iterator begin() const { return (const_iterator)this->BeginX; }
        iterator end() { return (iterator)this->EndX; }
        const_iterator end() const { return (const_iterator)this->EndX; }
    protected:
        iterator capacity_ptr() { return (iterator)this->CapacityX; }
        const_iterator capacity_ptr() const { return (const_iterator)this->CapacityX;}
    public:
        
        // reverse iterator creation methods.
        reverse_iterator rbegin()            { return reverse_iterator(end()); }
        const_reverse_iterator rbegin() const{ return const_reverse_iterator(end()); }
        reverse_iterator rend()              { return reverse_iterator(begin()); }
        const_reverse_iterator rend() const { return const_reverse_iterator(begin());}
        
        size_type size() const { return end()-begin(); }
        size_type max_size() const { return size_type(-1) / sizeof(T); }
        
        size_t capacity() const { return capacity_ptr() - begin(); }
        
        pointer data() { return pointer(begin()); }
        const_pointer data() const { return const_pointer(begin()); }
        
        reference operator[](unsigned idx) {
            assert(begin() + idx < end());
            return begin()[idx];
        }
        const_reference operator[](unsigned idx) const {
            assert(begin() + idx < end());
            return begin()[idx];
        }
        
        reference front() {
            return begin()[0];
        }
        const_reference front() const {
            return begin()[0];
        }
        
        reference back() {
            return end()[-1];
        }
        const_reference back() const {
            return end()[-1];
        }
    };
    
    template <typename T, bool isPodLike>
    class SmallVectorTemplateBase : public SmallVectorTemplateCommon<T> {
    public:
        SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {}
        
        static void destroy_range(T *S, T *E) {
            while (S != E) {
                --E;
                E->~T();
            }
        }
        
        template<typename It1, typename It2>
        static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
            std::uninitialized_copy(I, E, Dest);
        }
        
        void grow(size_t MinSize = 0);
    };
    
    // Define this out-of-line to dissuade the C++ compiler from inlining it.
    template <typename T, bool isPodLike>
    void SmallVectorTemplateBase<T, isPodLike>::grow(size_t MinSize) {
        size_t CurCapacity = this->capacity();
        size_t CurSize = this->size();
  size_t NewCapacity = 2*CurCapacity + 1; // Always grow, even from zero.
        if (NewCapacity < MinSize)
            NewCapacity = MinSize;
        T *NewElts = static_cast<T*>(malloc(NewCapacity*sizeof(T)));
        
        // Copy the elements over.
        this->uninitialized_copy(this->begin(), this->end(), NewElts);
        
        // Destroy the original elements.
        destroy_range(this->begin(), this->end());
        
        // If this wasn't grown from the inline copy, deallocate the old space.
        if (!this->isSmall())
            free(this->begin());
        
        this->setEnd(NewElts+CurSize);
        this->BeginX = NewElts;
        this->CapacityX = this->begin()+NewCapacity;
    }
    
    
    template <typename T>
    class SmallVectorTemplateBase<T, true> : public SmallVectorTemplateCommon<T> {
    public:
        SmallVectorTemplateBase(size_t Size) : SmallVectorTemplateCommon<T>(Size) {}
        
        // No need to do a destroy loop for POD's.
        static void destroy_range(T *, T *) {}
        
        template<typename It1, typename It2>
        static void uninitialized_copy(It1 I, It1 E, It2 Dest) {
            // Arbitrary iterator types; just use the basic implementation.
            std::uninitialized_copy(I, E, Dest);
        }
        
        template<typename T1, typename T2>
        static void uninitialized_copy(T1 *I, T1 *E, T2 *Dest) {
            // Use memcpy for PODs iterated by pointers (which includes SmallVector
            // iterators): std::uninitialized_copy optimizes to memmove, but we can
            // use memcpy here.
            memcpy(Dest, I, (E-I)*sizeof(T));
        }
        
        void grow(size_t MinSize = 0) {
            this->grow_pod(MinSize*sizeof(T), sizeof(T));
        }
    };
    
    
    template <typename T>
    class SmallVectorImpl : public SmallVectorTemplateBase<T, isPodLike<T>::value> {
        typedef SmallVectorTemplateBase<T, isPodLike<T>::value > SuperClass;
        
        SmallVectorImpl(const SmallVectorImpl&); // DISABLED.
    public:
        typedef typename SuperClass::iterator iterator;
        typedef typename SuperClass::size_type size_type;
        
        // Default ctor - Initialize to empty.
        explicit SmallVectorImpl(unsigned N)
        : SmallVectorTemplateBase<T, isPodLike<T>::value>(N*sizeof(T)) {
        }
        
        ~SmallVectorImpl() {
            // Destroy the constructed elements in the vector.
            this->destroy_range(this->begin(), this->end());
            
            // If this wasn't grown from the inline copy, deallocate the old space.
            if (!this->isSmall())
                free(this->begin());
        }
        
        
        void clear() {
            this->destroy_range(this->begin(), this->end());
            this->EndX = this->BeginX;
        }
        
        void resize(unsigned N) {
            if (N < this->size()) {
                this->destroy_range(this->begin()+N, this->end());
                this->setEnd(this->begin()+N);
            } else if (N > this->size()) {
                if (this->capacity() < N)
                    this->grow(N);
                this->construct_range(this->end(), this->begin()+N, T());
                this->setEnd(this->begin()+N);
            }
        }
        
        void resize(unsigned N, const T &NV) {
            if (N < this->size()) {
                this->destroy_range(this->begin()+N, this->end());
                this->setEnd(this->begin()+N);
            } else if (N > this->size()) {
                if (this->capacity() < N)
                    this->grow(N);
                construct_range(this->end(), this->begin()+N, NV);
                this->setEnd(this->begin()+N);
            }
        }
        
        void reserve(unsigned N) {
            if (this->capacity() < N)
                this->grow(N);
        }
        
        void push_back(const T &Elt) {
            if (this->EndX < this->CapacityX) {
            Retry:
                new (this->end()) T(Elt);
                this->setEnd(this->end()+1);
                return;
            }
            this->grow();
            goto Retry;
        }
        
        void pop_back() {
            this->setEnd(this->end()-1);
            this->end()->~T();
        }
        
        T pop_back_val() {
            T Result = this->back();
            pop_back();
            return Result;
        }
        
        void swap(SmallVectorImpl &RHS);
        
        template<typename in_iter>
        void append(in_iter in_start, in_iter in_end) {
            size_type NumInputs = std::distance(in_start, in_end);
            // Grow allocated space if needed.
            if (NumInputs > size_type(this->capacity_ptr()-this->end()))
                this->grow(this->size()+NumInputs);
            
            // Copy the new elements over.
            // TODO: NEED To compile time dispatch on whether in_iter is a random access
            // iterator to use the fast uninitialized_copy.
            std::uninitialized_copy(in_start, in_end, this->end());
            this->setEnd(this->end() + NumInputs);
        }
        
        void append(size_type NumInputs, const T &Elt) {
            // Grow allocated space if needed.
            if (NumInputs > size_type(this->capacity_ptr()-this->end()))
                this->grow(this->size()+NumInputs);
            
            // Copy the new elements over.
            std::uninitialized_fill_n(this->end(), NumInputs, Elt);
            this->setEnd(this->end() + NumInputs);
        }
        
        void assign(unsigned NumElts, const T &Elt) {
            clear();
            if (this->capacity() < NumElts)
                this->grow(NumElts);
            this->setEnd(this->begin()+NumElts);
            construct_range(this->begin(), this->end(), Elt);
        }
        
        iterator erase(iterator I) {
            iterator N = I;
            // Shift all elts down one.
            std::copy(I+1, this->end(), I);
            // Drop the last elt.
            pop_back();
            return(N);
        }
        
        iterator erase(iterator S, iterator E) {
            iterator N = S;
            // Shift all elts down.
            iterator I = std::copy(E, this->end(), S);
            // Drop the last elts.
            this->destroy_range(I, this->end());
            this->setEnd(I);
            return(N);
        }
        
        iterator insert(iterator I, const T &Elt) {
            if (I == this->end()) {  // Important special case for empty vector.
                push_back(Elt);
                return this->end()-1;
            }
            
            if (this->EndX < this->CapacityX) {
            Retry:
                new (this->end()) T(this->back());
                this->setEnd(this->end()+1);
                // Push everything else over.
                std::copy_backward(I, this->end()-1, this->end());
                *I = Elt;
                return I;
            }
            size_t EltNo = I-this->begin();
            this->grow();
            I = this->begin()+EltNo;
            goto Retry;
        }
        
        iterator insert(iterator I, size_type NumToInsert, const T &Elt) {
            if (I == this->end()) {  // Important special case for empty vector.
                append(NumToInsert, Elt);
                return this->end()-1;
            }
            
            // Convert iterator to elt# to avoid invalidating iterator when we reserve()
            size_t InsertElt = I - this->begin();
            
            // Ensure there is enough space.
            reserve(static_cast<unsigned>(this->size() + NumToInsert));
            
            // Uninvalidate the iterator.
            I = this->begin()+InsertElt;
            
            // If there are more elements between the insertion point and the end of the
            // range than there are being inserted, we can use a simple approach to
            // insertion.  Since we already reserved space, we know that this won't
            // reallocate the vector.
            if (size_t(this->end()-I) >= NumToInsert) {
                T *OldEnd = this->end();
                append(this->end()-NumToInsert, this->end());
                
                // Copy the existing elements that get replaced.
                std::copy_backward(I, OldEnd-NumToInsert, OldEnd);
                
                std::fill_n(I, NumToInsert, Elt);
                return I;
            }
            
            // Otherwise, we're inserting more elements than exist already, and we're
            // not inserting at the end.
            
            // Copy over the elements that we're about to overwrite.
            T *OldEnd = this->end();
            this->setEnd(this->end() + NumToInsert);
            size_t NumOverwritten = OldEnd-I;
            this->uninitialized_copy(I, OldEnd, this->end()-NumOverwritten);
            
            // Replace the overwritten part.
            std::fill_n(I, NumOverwritten, Elt);
            
            // Insert the non-overwritten middle part.
            std::uninitialized_fill_n(OldEnd, NumToInsert-NumOverwritten, Elt);
            return I;
        }
        
        template<typename ItTy>
        iterator insert(iterator I, ItTy From, ItTy To) {
            if (I == this->end()) {  // Important special case for empty vector.
                append(From, To);
                return this->end()-1;
            }
            
            size_t NumToInsert = std::distance(From, To);
            // Convert iterator to elt# to avoid invalidating iterator when we reserve()
            size_t InsertElt = I - this->begin();
            
            // Ensure there is enough space.
            reserve(static_cast<unsigned>(this->size() + NumToInsert));
            
            // Uninvalidate the iterator.
            I = this->begin()+InsertElt;
            
            // If there are more elements between the insertion point and the end of the
            // range than there are being inserted, we can use a simple approach to
            // insertion.  Since we already reserved space, we know that this won't
            // reallocate the vector.
            if (size_t(this->end()-I) >= NumToInsert) {
                T *OldEnd = this->end();
                append(this->end()-NumToInsert, this->end());
                
                // Copy the existing elements that get replaced.
                std::copy_backward(I, OldEnd-NumToInsert, OldEnd);
                
                std::copy(From, To, I);
                return I;
            }
            
            // Otherwise, we're inserting more elements than exist already, and we're
            // not inserting at the end.
            
            // Copy over the elements that we're about to overwrite.
            T *OldEnd = this->end();
            this->setEnd(this->end() + NumToInsert);
            size_t NumOverwritten = OldEnd-I;
            this->uninitialized_copy(I, OldEnd, this->end()-NumOverwritten);
            
            // Replace the overwritten part.
            for (; NumOverwritten > 0; --NumOverwritten) {
                *I = *From;
                ++I; ++From;
            }
            
            // Insert the non-overwritten middle part.
            this->uninitialized_copy(From, To, OldEnd);
            return I;
        }
        
        const SmallVectorImpl
        &operator=(const SmallVectorImpl &RHS);
        
        bool operator==(const SmallVectorImpl &RHS) const {
            if (this->size() != RHS.size()) return false;
            return std::equal(this->begin(), this->end(), RHS.begin());
        }
        bool operator!=(const SmallVectorImpl &RHS) const {
            return !(*this == RHS);
        }
        
        bool operator<(const SmallVectorImpl &RHS) const {
            return std::lexicographical_compare(this->begin(), this->end(),
                                                RHS.begin(), RHS.end());
        }
        
        void set_size(unsigned N) {
            assert(N <= this->capacity());
            this->setEnd(this->begin() + N);
        }
        
    private:
        static void construct_range(T *S, T *E, const T &Elt) {
            for (; S != E; ++S)
                new (S) T(Elt);
        }
    };
    
    
    template <typename T>
    void SmallVectorImpl<T>::swap(SmallVectorImpl<T> &RHS) {
        if (this == &RHS) return;
        
        // We can only avoid copying elements if neither vector is small.
        if (!this->isSmall() && !RHS.isSmall()) {
            std::swap(this->BeginX, RHS.BeginX);
            std::swap(this->EndX, RHS.EndX);
            std::swap(this->CapacityX, RHS.CapacityX);
            return;
        }
        if (RHS.size() > this->capacity())
            this->grow(RHS.size());
        if (this->size() > RHS.capacity())
            RHS.grow(this->size());
        
        // Swap the shared elements.
        size_t NumShared = this->size();
        if (NumShared > RHS.size()) NumShared = RHS.size();
        for (unsigned i = 0; i != static_cast<unsigned>(NumShared); ++i)
            std::swap((*this)[i], RHS[i]);
        
        // Copy over the extra elts.
        if (this->size() > RHS.size()) {
            size_t EltDiff = this->size() - RHS.size();
            this->uninitialized_copy(this->begin()+NumShared, this->end(), RHS.end());
            RHS.setEnd(RHS.end()+EltDiff);
            this->destroy_range(this->begin()+NumShared, this->end());
            this->setEnd(this->begin()+NumShared);
        } else if (RHS.size() > this->size()) {
            size_t EltDiff = RHS.size() - this->size();
            this->uninitialized_copy(RHS.begin()+NumShared, RHS.end(), this->end());
            this->setEnd(this->end() + EltDiff);
            this->destroy_range(RHS.begin()+NumShared, RHS.end());
            RHS.setEnd(RHS.begin()+NumShared);
        }
    }
    
    template <typename T>
    const SmallVectorImpl<T> &SmallVectorImpl<T>::
	operator=(const SmallVectorImpl<T> &RHS) {
        // Avoid self-assignment.
        if (this == &RHS) return *this;
        
        // If we already have sufficient space, assign the common elements, then
        // destroy any excess.
        size_t RHSSize = RHS.size();
        size_t CurSize = this->size();
        if (CurSize >= RHSSize) {
            // Assign common elements.
            iterator NewEnd;
            if (RHSSize)
                NewEnd = std::copy(RHS.begin(), RHS.begin()+RHSSize, this->begin());
            else
                NewEnd = this->begin();
            
            // Destroy excess elements.
            this->destroy_range(NewEnd, this->end());
            
            // Trim.
            this->setEnd(NewEnd);
            return *this;
        }
        
        // If we have to grow to have enough elements, destroy the current elements.
        // This allows us to avoid copying them during the grow.
        if (this->capacity() < RHSSize) {
            // Destroy current elements.
            this->destroy_range(this->begin(), this->end());
            this->setEnd(this->begin());
            CurSize = 0;
            this->grow(RHSSize);
        } else if (CurSize) {
            // Otherwise, use assignment for the already-constructed elements.
            std::copy(RHS.begin(), RHS.begin()+CurSize, this->begin());
        }
        
        // Copy construct the new elements in place.
        this->uninitialized_copy(RHS.begin()+CurSize, RHS.end(),
                                 this->begin()+CurSize);
        
        // Set end.
        this->setEnd(this->begin()+RHSSize);
        return *this;
    }
    
    
    template <typename T, unsigned N>
    class SmallVector : public SmallVectorImpl<T> {
        typedef typename SmallVectorImpl<T>::U U;
        enum {
            // MinUs - The number of U's require to cover N T's.
            MinUs = (static_cast<unsigned int>(sizeof(T))*N +
                     static_cast<unsigned int>(sizeof(U)) - 1) /
            static_cast<unsigned int>(sizeof(U)),
            
            // NumInlineEltsElts - The number of elements actually in this array.  There
            // is already one in the parent class, and we have to round up to avoid
            // having a zero-element array.
            NumInlineEltsElts = MinUs > 1 ? (MinUs - 1) : 1,
            
            // NumTsAvailable - The number of T's we actually have space for, which may
            // be more than N due to rounding.
            NumTsAvailable = (NumInlineEltsElts+1)*static_cast<unsigned int>(sizeof(U))/
            static_cast<unsigned int>(sizeof(T))
        };
        U InlineElts[NumInlineEltsElts];
    public:
        SmallVector() : SmallVectorImpl<T>(NumTsAvailable) {
        }
        
        explicit SmallVector(unsigned Size, const T &Value = T())
        : SmallVectorImpl<T>(NumTsAvailable) {
            this->reserve(Size);
            while (Size--)
                this->push_back(Value);
        }
        
        template<typename ItTy>
        SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(NumTsAvailable) {
            this->append(S, E);
        }
        
        SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(NumTsAvailable) {
            if (!RHS.empty())
                SmallVectorImpl<T>::operator=(RHS);
        }
        
        const SmallVector &operator=(const SmallVector &RHS) {
            SmallVectorImpl<T>::operator=(RHS);
            return *this;
        }
        
    };

template <typename T>
class SmallVector<T,0> : public SmallVectorImpl<T> {
public:
  SmallVector() : SmallVectorImpl<T>(0) {}

  explicit SmallVector(unsigned Size, const T &Value = T())
    : SmallVectorImpl<T>(0) {
    this->reserve(Size);
    while (Size--)
      this->push_back(Value);
  }

  template<typename ItTy>
  SmallVector(ItTy S, ItTy E) : SmallVectorImpl<T>(0) {
    this->append(S, E);
  }

  SmallVector(const SmallVector &RHS) : SmallVectorImpl<T>(0) {
    SmallVectorImpl<T>::operator=(RHS);
  }

  SmallVector &operator=(const SmallVectorImpl<T> &RHS) {
    return SmallVectorImpl<T>::operator=(RHS);
  }

};

} // End Ogre namespace

namespace std {
    template<typename T>
    inline void
    swap(Ogre::SmallVectorImpl<T> &LHS, Ogre::SmallVectorImpl<T> &RHS) {
        LHS.swap(RHS);
    }
    
    template<typename T, unsigned N>
    inline void
    swap(Ogre::SmallVector<T, N> &LHS, Ogre::SmallVector<T, N> &RHS) {
        LHS.swap(RHS);
    }
}

#endif