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// FILE: bag1.h
// CLASS PROVIDED: bag (part of the namespace main_savitch_3)
//
// TYPEDEF 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 CAPACITY = _____
// bag::CAPACITY is the maximum number of items that a bag can hold.
//
// CONSTRUCTOR for the bag class:
// bag( )
// Postcondition: The bag has been initialized as an empty bag.
//
// MODIFICATION MEMBER FUNCTIONS for the bag class:
// 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)
// Precondition: size( ) < CAPACITY.
// Postcondition: A new copy of entry has been added to the bag.
//
// void operator +=(const bag& addend)
// Precondition: size( ) + addend.size( ) <= CAPACITY.
// Postcondition: Each item in addend has been added to this bag.
//
// CONSTANT MEMBER FUNCTIONS for the bag class:
// size_type size( ) const
// Postcondition: The return value is the total number of items in the bag.
//
// size_type count(const value_type& target) const
// Postcondition: The 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)
// Precondition: b1.size( ) + b2.size( ) <= bag::CAPACITY.
// 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.
#ifndef MAIN_SAVITCH_BAG1_H
#define MAIN_SAVITCH_BAG1_H
#include <cstdlib> // Provides size_t
namespace main_savitch_3
{
class bag
{
public:
// TYPEDEFS and MEMBER CONSTANTS
typedef int value_type;
typedef std::size_t size_type;
static const size_type CAPACITY = 30;
// CONSTRUCTOR
bag( ) { used = 0; }
// MODIFICATION MEMBER FUNCTIONS
size_type erase(const value_type& target);
bool erase_one(const value_type& target);
void insert(const value_type& entry);
void operator +=(const bag& addend);
// CONSTANT MEMBER FUNCTIONS
size_type size( ) const { return used; }
size_type count(const value_type& target) const;
private:
value_type data[CAPACITY]; // The array to store items
size_type used; // How much of array is used
};
// NONMEMBER FUNCTIONS for the bag class
bag operator +(const bag& b1, const bag& b2);
}
#endif
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