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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 /chapter2/throttle.h | |
| download | dscode-c1b6ffe70bd281c6c230fd63fabcaac2aff47514.tar.xz dscode-c1b6ffe70bd281c6c230fd63fabcaac2aff47514.zip | |
Diffstat (limited to 'chapter2/throttle.h')
| -rw-r--r-- | chapter2/throttle.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/chapter2/throttle.h b/chapter2/throttle.h new file mode 100644 index 0000000..8707b37 --- /dev/null +++ b/chapter2/throttle.h @@ -0,0 +1,58 @@ +// FILE: throttle.h
+// CLASS PROVIDED: throttle (part of the namespace main_savitch_chapter2)
+//
+// CONSTRUCTORS for the throttle class:
+// throttle( )
+// Postcondition: The throttle has one position above the shut_off position,
+// and it is currently shut off.
+//
+// throttle(int size)
+// Precondition: size > 0.
+// Postcondition: The throttle has size positions above the shut_off
+// position, and it is currently shut off.
+//
+// MODIFICATION MEMBER FUNCTIONS for the throttle class:
+// void shut_off( )
+// Postcondition: The throttle has been turned off.
+//
+// void shift(int amount)
+// Postcondition: The throttle's position has been moved by
+// amount (but not below 0 or above the top position).
+//
+// CONSTANT MEMBER FUNCTIONS for the throttle class:
+// double flow( ) const
+// Postcondition: The value returned is the current flow as a
+// proportion of the maximum flow.
+//
+// bool is_on( ) const
+// Postcondition: If the throttle's flow is above 0 then
+// the function returns true; otherwise it returns false.
+//
+// VALUE SEMANTICS for the throttle class: (See discussion on page 51.)
+// Assignments and the copy constructor may be used with throttle objects.
+
+#ifndef MAIN_SAVITCH_THROTTLE
+#define MAIN_SAVITCH_THROTTLE
+
+namespace main_savitch_2A
+{
+ class throttle
+ {
+ public:
+ // CONSTRUCTORS
+ throttle( );
+ throttle(int size);
+ // MODIFICATION MEMBER FUNCTIONS
+ void shut_off( ) { position = 0; }
+ void shift(int amount);
+ // CONSTANT MEMBER FUNCTIONS
+ double flow( ) const { return position / double(top_position); }
+ bool is_on( ) const { return (position > 0); }
+ private:
+ int top_position;
+ int position;
+ };
+
+}
+
+#endif
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