dynamic-array.hpp

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/* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
/*
 *  Main authors:
 *     Christian Schulte <schulte@gecode.org>
 *
 *  Copyright:
 *     Christian Schulte, 2002
 *
 *  Last modified:
 *     $Date: 2016-06-18 14:20:49 +0200 (Sat, 18 Jun 2016) $ by $Author: schulte $
 *     $Revision: 15118 $
 *
 *  This file is part of Gecode, the generic constraint
 *  development environment:
 *     http://www.gecode.org
 *
 *  Permission is hereby granted, free of charge, to any person obtaining
 *  a copy of this software and associated documentation files (the
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 *  permit persons to whom the Software is furnished to do so, subject to
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 */

#include <algorithm>

namespace Gecode { namespace Support {

  template<class T, class A>
  class DynamicArray {
  private:
    A& a;
    int n;
    T*  x;
    void resize(int n);
  public:
    DynamicArray(A& a0, int n = 32);
    DynamicArray(A& a0, unsigned int n);
    DynamicArray(const DynamicArray<T,A>& da);
    ~DynamicArray(void);

    const DynamicArray<T,A>& operator =(const DynamicArray<T,A>& da);

    T& operator [](int i);
    T& operator [](unsigned int i);
    const T& operator [](int i) const;
    const T& operator [](unsigned int i) const;

    operator T*(void);
  };


  template<class T, class A>
  forceinline
  DynamicArray<T,A>::DynamicArray(A& a0, int n0)
    : a(a0), n(n0), x(a.template alloc<T>(n)) {}

  template<class T, class A>
  forceinline
  DynamicArray<T,A>::DynamicArray(A& a0, unsigned int n0)
    : a(a0), n(static_cast<int>(n0)), x(a.template alloc<T>(n)) {}

  template<class T, class A>
  forceinline
  DynamicArray<T,A>::DynamicArray(const DynamicArray<T,A>& da)
    : a(da.a), n(da.n), x(a.template alloc<T>(n)) {
    (void) heap.copy<T>(x,da.x,n);
  }

  template<class T, class A>
  forceinline
  DynamicArray<T,A>::~DynamicArray(void) {
    a.free(x,n);
  }

  template<class T, class A>
  forceinline const DynamicArray<T,A>&
  DynamicArray<T,A>::operator =(const DynamicArray<T,A>& da) {
    if (this != &da) {
      if (n < da.n) {
        a.free(x,n); n = da.n; x = a.template alloc<T>(n);
      }
      (void) heap.copy(x,da.x,n);
    }
    return *this;
  }

  template<class T, class A>
  void
  DynamicArray<T,A>::resize(int i) {
    int m = std::max(i+1, (3*n)/2);
    x = a.realloc(x,n,m);
    n = m;
  }

  template<class T, class A>
  forceinline T&
  DynamicArray<T,A>::operator [](int i) {
    if (i >= n) resize(i);
    assert(n > i);
    return x[i];
  }

  template<class T, class A>
  forceinline T&
  DynamicArray<T,A>::operator [](unsigned int i) {
    return operator [](static_cast<int>(i));
  }

  template<class T, class A>
  forceinline const T&
  DynamicArray<T,A>::operator [](int i) const {
    assert(n > i);
    return x[i];
  }

  template<class T, class A>
  forceinline const T&
  DynamicArray<T,A>::operator [](unsigned int i) const {
    return operator [](static_cast<int>(i));
  }

  template<class T, class A>
  forceinline
  DynamicArray<T,A>::operator T*(void) {
    return x;
  }

}}

// STATISTICS: support-any