static-stack.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: 2009-09-08 21:10:29 +0200 (Tue, 08 Sep 2009) $ by $Author: schulte $
 *     $Revision: 9692 $
 *
 *  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
 *  "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so, subject to
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namespace Gecode { namespace Support {

  template<class T, class A>
  class StaticStack {
  private:
    A& a;
    int n;
    unsigned int tos;
    T* stack;
  public:
    StaticStack(A& a, int n);
    ~StaticStack(void);

    void reset(void);
    bool empty(void) const;
    int entries(void) const;

    T pop(void);
    T& top(void) const;
    T& last(void) const;
    void push(const T& x);

  private:
    static void* operator new(size_t s) throw() { (void) s; return NULL; }
    static void  operator delete(void* p) { (void) p; };
    StaticStack(const StaticStack& s) : a(s.a) {}
    const StaticStack& operator =(const StaticStack&) { return *this; }
  };

  template<class T, class A>
  forceinline
  StaticStack<T,A>::StaticStack(A& a0, int n0)
    : a(a0), n(n0), tos(0), stack(a.template alloc<T>(n)) {}

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

  template<class T, class A>
  forceinline bool
  StaticStack<T,A>::empty(void) const {
    return tos==0;
  }

  template<class T, class A>
  forceinline int
  StaticStack<T,A>::entries(void) const {
    return tos;
  }

  template<class T, class A>
  forceinline void
  StaticStack<T,A>::reset(void) {
    tos = 0;
  }

  template<class T, class A>
  forceinline T
  StaticStack<T,A>::pop(void) {
    assert((tos > 0) && (tos <= static_cast<unsigned int>(n)));
    return stack[--tos];
  }

  template<class T, class A>
  forceinline T&
  StaticStack<T,A>::top(void) const {
    assert((tos > 0) && (tos <= static_cast<unsigned int>(n)));
    return stack[tos-1];
  }

  template<class T, class A>
  forceinline T&
  StaticStack<T,A>::last(void) const {
    assert((tos >= 0) && (tos < static_cast<unsigned int>(n)));
    return stack[tos];
  }

  template<class T, class A>
  forceinline void
  StaticStack<T,A>::push(const T& x) {
    assert(tos < static_cast<unsigned int>(n));
    stack[tos++] = x;
  }

}}

// STATISTICS: support-any