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// FILE: bag2.h
// CLASS PROVIDED: bag (a container class for a collection of items)
//
// TYPEDEFS and MEMBER CONSTANTS for the bag class:
// typedef _____ value_type
// bag::value_type is the data type of the items in the bag. It may be any of
// the C++ built-in types (int, char, etc.), or a class with a default
// constructor, an assignment operator, and operators to
// test for equality (x == y) and non-equality (x != y).
//
// typedef _____ size_type
// bag::size_type is the data type of any variable that keeps track of how
// many items are in a bag.
//
// static const size_type DEFAULT_CAPACITY = _____
// bag::DEFAULT_CAPACITY is the initial capacity of a bag that is created
// by the default constructor.
//
// CONSTRUCTOR for the bag class:
// bag(size_type initial_capacity = DEFAULT_CAPACITY)
// Postcondition: The bag is empty with an initial capacity given by the
// parameter. The insert function will work efficiently (without
// allocating new memory) until this capacity is reached.
//
// MODIFICATION MEMBER FUNCTIONS for the bag class:
// void reserve(size_type new_capacity)
// Postcondition: The bag's current capacity is changed to the
// new_capacity (but not less than the number of items already in the
// bag). The insert function will work efficiently (without allocating
// new memory) until the new capacity is reached.
//
// size_type erase(const value_type& target);
// Postcondition: All copies of target have been removed from the bag.
// The return value is the number of copies removed (which could be zero).
//
// void erase_one(const value_type& target)
// Postcondition: If target was in the bag, then one copy has been removed;
// otherwise the bag is unchanged. A true return value indicates that one
// copy was removed; false indicates that nothing was removed.
//
// void insert(const value_type& entry)
// Postcondition: A new copy of entry has been inserted into the bag.
//
// void operator +=(const bag& addend)
// Postcondition: Each item in addend has been added to this bag.
//
// CONSTANT MEMBER FUNCTIONS for the bag class:
// size_type size( ) const
// Postcondition: Return value is the total number of items in the bag.
//
// size_type count(const value_type& target) const
// Postcondition: Return value is number of times target is in the bag
//
// NONMEMBER FUNCTIONS for the bag class:
// bag operator +(const bag& b1, const bag& b2)
// Postcondition: The bag returned is the union of b1 and b2.
//
// VALUE SEMANTICS for the bag class:
// Assignments and the copy constructor may be used with bag objects.
//
// DYNAMIC MEMORY USAGE by the bag:
// If there is insufficient dynamic memory, then the following functions throw
// bad_alloc: The constructors, reserve, insert, operator += ,
// operator +, and the assignment operator.
#ifndef MAIN_SAVITCH_BAG2_H
#define MAIN_SAVITCH_BAG2_H
#include <cstdlib> // Provides size_t
namespace main_savitch_4
{
class bag
{
public:
// TYPEDEFS and MEMBER CONSTANTS
typedef int value_type;
typedef std::size_t size_type;
static const size_type DEFAULT_CAPACITY = 30;
// CONSTRUCTORS and DESTRUCTOR
bag(size_type initial_capacity = DEFAULT_CAPACITY);
bag(const bag& source); // copy constructor -- bag b2(b1);
~bag( );
// MODIFICATION MEMBER FUNCTIONS
void reserve(size_type new_capacity);
bool erase_one(const value_type& target);
size_type erase(const value_type& target);
void insert(const value_type& entry);
void operator +=(const bag& addend); // b2 += b1;
void operator =(const bag& source); // b2 = b1;
// CONSTANT MEMBER FUNCTIONS
size_type size( ) const
{ return used; }
size_type count(const value_type& target) const;
private:
value_type *data; // Pointer to partially filled dynamic array
size_type used; // How much of array is being used
size_type capacity; // Current capacity of the bag
};
// NONMEMBER FUNCTIONS for the bag class
bag operator +(const bag& b1, const bag& b2); // b3 = b1 + b2;
}
#endif
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