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| author | Fuwn <[email protected]> | 2024-04-07 23:18:32 -0700 |
|---|---|---|
| committer | Fuwn <[email protected]> | 2024-04-07 23:18:32 -0700 |
| commit | c1b6ffe70bd281c6c230fd63fabcaac2aff47514 (patch) | |
| tree | e8af3b1782a7cd0754590ed618fddc1bdb9b7385 /chapter5/bag3.h | |
| download | dscode-main.tar.xz dscode-main.zip | |
Diffstat (limited to 'chapter5/bag3.h')
| -rw-r--r-- | chapter5/bag3.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/chapter5/bag3.h b/chapter5/bag3.h new file mode 100644 index 0000000..7907a94 --- /dev/null +++ b/chapter5/bag3.h @@ -0,0 +1,94 @@ +// FILE: bag3.h
+// CLASS PROVIDED: bag (part of the namespace main_savitch_5)
+//
+// TYPEDEFS for the bag class:
+// 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, a copy constructor, an assignment
+// operator, and a test for equality (x == y).
+//
+// bag::size_type
+// is the data type of any variable that keeps track of how many items are
+// in a bag
+//
+// CONSTRUCTOR for the bag class:
+// bag( )
+// Postcondition: The bag is empty.
+//
+// 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).
+//
+// bool erase_one(const value_type& target)
+// Postcondition: If target was in the bag, then one copy of target has
+// been removed from the bag; 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.
+//
+// value_type grab( ) const
+// Precondition: size( ) > 0.
+// Postcondition: The return value is a randomly selected item from 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, insert, operator +=, operator +, and the
+// assignment operator.
+
+#ifndef MAIN_SAVITCH_BAG3_H
+#define MAIN_SAVITCH_BAG3_H
+#include <cstdlib> // Provides size_t and NULL
+#include "node1.h" // Provides node class
+namespace main_savitch_5
+{
+ class bag
+ {
+ public:
+ // TYPEDEFS
+ typedef std::size_t size_type;
+ typedef node::value_type value_type;
+ // CONSTRUCTORS and DESTRUCTOR
+ bag( ); // bag b2;
+ bag(const bag& source); // bag b3(b2);
+ ~bag( );
+ // 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);
+ void operator =(const bag& source);
+ // CONSTANT MEMBER FUNCTIONS
+ size_type size( ) const { return many_nodes; }
+ size_type count(const value_type& target) const;
+ value_type grab( ) const;
+ private:
+ node *head_ptr; // List head pointer
+ size_type many_nodes; // Number of nodes on the list
+ };
+
+ // NONMEMBER FUNCTIONS for the bag class:
+ bag operator +(const bag& b1, const bag& b2);
+}
+#endif
+
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