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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 /chapter7/stack1.h | |
| download | dscode-main.tar.xz dscode-main.zip | |
Diffstat (limited to 'chapter7/stack1.h')
| -rw-r--r-- | chapter7/stack1.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/chapter7/stack1.h b/chapter7/stack1.h new file mode 100644 index 0000000..d6ea8fe --- /dev/null +++ b/chapter7/stack1.h @@ -0,0 +1,79 @@ +// FILE: stack1.h (part of the namespace main_savitch_7A)
+// TEMPLATE CLASS PROVIDED: stack<Item>
+//
+// TEMPLATE PARAMETER, TYPEDEFS and MEMBER CONSTANTS for the stack<Item> class:
+// The template parameter, Item, is the data type of the items in the stack,
+// also defined as stack<Item>::value_type. It may be any of the C++ built-in
+// types (int, char, etc.), or a class with a default constructor, a copy
+// constructor, and an assignment operator. The definition
+// stack<Item>::size_type is the data type of any variable that keeps track of
+// how many items are in a stack. The static const CAPACITY is the
+// maximum capacity of a stack for this first stack implementation.
+// NOTE:
+// Many compilers require the use of the new keyword typename before using
+// the expressions stack<Item>::value_type and stack<Item>::size_type.
+// Otherwise the compiler doesn't have enough information to realize that it
+// is the name of a data type.
+//
+// CONSTRUCTOR for the stack<Item> template class:
+// stack( )
+// Postcondition: The stack has been initialized as an empty stack.
+//
+// MODIFICATION MEMBER FUNCTIONS for the stack<Item> class:
+// void push(const Item& entry)
+// Precondition: size( ) < CAPACITY.
+// Postcondition: A new copy of entry has been pushed onto the stack.
+//
+// Item pop( )
+// Precondition: size( ) > 0.
+// Postcondition: The top item of the stack has been removed.
+//
+// CONSTANT MEMBER FUNCTIONS for the stack<Item> class:
+// bool empty( ) const
+// Postcondition: Return value is true if the stack is empty.
+//
+// size_type size( ) const
+// Postcondition: Return value is the total number of items in the stack.
+//
+// Item top( )
+// Precondition: size( ) > 0.
+// Postcondition: The return value is the top item of the stack but the
+// stack is unchanged. This differs slightly from the STL stack (where
+// the top function returns a reference to the item on top of the stack).
+//
+// VALUE SEMANTICS for the stack<Item> class:
+// Assignments and the copy constructor may be used with stack<Item>
+// objects.
+
+#ifndef MAIN_SAVITCH_STACK1_H
+#define MAIN_SAVITCH_STACK1_H
+#include <cstdlib> // Provides size_t
+
+namespace main_savitch_7A
+{
+ template <class Item>
+ class stack
+ {
+ public:
+ // TYPEDEFS AND MEMBER CONSTANT -- See Appendix E if this fails to compile.
+ typedef std::size_t size_type;
+ typedef Item value_type;
+ static const size_type CAPACITY = 30;
+ // CONSTRUCTOR
+ stack( ) { used = 0; }
+ // MODIFICATION MEMBER FUNCTIONS
+ void push(const Item& entry);
+ void pop( );
+ // CONSTANT MEMBER FUNCTIONS
+ bool empty( ) const { return (used == 0); }
+ size_type size( ) const { return used; }
+ Item top( ) const;
+ private:
+ Item data[CAPACITY]; // Partially filled array
+ size_type used; // How much of array is being used
+ };
+}
+
+#include "stack1.template" // Include the implementation.
+#endif
+
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