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static-stack.hpp
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1 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
2 /*
3  * Main authors:
4  * Christian Schulte <schulte@gecode.org>
5  *
6  * Copyright:
7  * Christian Schulte, 2002
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33 
34 namespace Gecode { namespace Support {
35 
41  template<class T, class A>
42  class StaticStack {
43  private:
45  A& a;
47  int n;
49  unsigned int tos;
51  T* stack;
52  public:
54  StaticStack(A& a, int n);
56  ~StaticStack(void);
57 
59  void reset(void);
61  bool empty(void) const;
63  int entries(void) const;
64 
66  T pop(void);
68  T& top(void) const;
70  T& last(void) const;
72  void push(const T& x);
73 
74  private:
76  static void* operator new(size_t s) throw() { (void) s; return NULL; }
78  static void operator delete(void* p) { (void) p; };
80  StaticStack(const StaticStack& s) : a(s.a) {}
82  const StaticStack& operator =(const StaticStack&) { return *this; }
83  };
84 
85  template<class T, class A>
88  : a(a0), n(n0), tos(0), stack(a.template alloc<T>(n)) {}
89 
90  template<class T, class A>
93  a.free(stack,n);
94  }
95 
96  template<class T, class A>
97  forceinline bool
99  return tos==0;
100  }
101 
102  template<class T, class A>
103  forceinline int
105  return tos;
106  }
107 
108  template<class T, class A>
109  forceinline void
111  tos = 0;
112  }
113 
114  template<class T, class A>
115  forceinline T
117  assert((tos > 0) && (tos <= static_cast<unsigned int>(n)));
118  return stack[--tos];
119  }
120 
121  template<class T, class A>
122  forceinline T&
123  StaticStack<T,A>::top(void) const {
124  assert((tos > 0) && (tos <= static_cast<unsigned int>(n)));
125  return stack[tos-1];
126  }
127 
128  template<class T, class A>
129  forceinline T&
131  assert((tos >= 0) && (tos < static_cast<unsigned int>(n)));
132  return stack[tos];
133  }
134 
135  template<class T, class A>
136  forceinline void
138  assert(tos < static_cast<unsigned int>(n));
139  stack[tos++] = x;
140  }
141 
142 }}
143 
144 // STATISTICS: support-any
int p
Number of positive literals for node type.
Definition: bool-expr.cpp:232
int n
Number of negative literals for node type.
Definition: bool-expr.cpp:234
Node * x
Pointer to corresponding Boolean expression node.
Definition: bool-expr.cpp:249
struct Gecode::@602::NNF::@65::@67 a
For atomic nodes.
Stack with fixed number of elements.
void push(const T &x)
Push element x on top of stack.
void reset(void)
Reset stack (pop all elements)
~StaticStack(void)
Release memory.
T pop(void)
Pop topmost element from stack and return it.
T & last(void) const
Return element that has just been popped.
bool empty(void) const
Test whether stack is empty.
StaticStack(A &a, int n)
Initialize for n elements.
T & top(void) const
Return element on top of stack.
int entries(void) const
Return number of entries currently on stack.
#define forceinline
Definition: config.hpp:194