Define a primitive data type: Difference between revisions
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The code below defines a new type <code>TinyInt</code>, provides bounds checking and implementation of all standard arithmetic operators: |
The code below defines a new type <code>TinyInt</code>, provides bounds checking and implementation of all standard arithmetic operators: |
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<lang dyalect>type TinyInt |
<lang dyalect>type TinyInt using { |
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var value |
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private { |
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func getInteger(x) { |
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match x { |
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Integer => x, |
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TinyInt => x.toInteger(), |
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_ => throw "Type \"\(x.getType()::name)\" is not supported by this operation." |
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} |
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} |
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func boundsCheck(x) { |
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if x < 1 || x > 10 { |
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throw "Overflow" |
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} |
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x |
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} |
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} |
} |
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func Integer.toInteger() => this |
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func TinyInt.TinyInt( |
static func TinyInt.TinyInt(Integer x) { |
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throw "Overflow" when x is <1 or >10 |
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boundsCheck(Integer(i)) |
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private()::value = x |
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} |
} |
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func TinyInt.toString() |
func TinyInt.toString() => "TinyInt (\(private()::value))" |
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this.toString() |
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} |
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func TinyInt.toInteger() |
func TinyInt.toInteger() => private()::value |
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this |
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} |
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func TinyInt + (other) |
func TinyInt + (other) => TinyInt(private()::value + other.toInteger()) |
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let z = this + getInteger(other) |
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TinyInt(z) |
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} |
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func TinyInt * (other) |
func TinyInt * (other) => TinyInt(private()::value * other.toInteger()) |
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let z = this * getInteger(other) |
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TinyInt(z) |
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} |
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func TinyInt - (other) |
func TinyInt - (other) => TinyInt(private()::value - other.toInteger()) |
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let z = this - getInteger(other) |
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TinyInt(z) |
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} |
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func TinyInt / (other) |
func TinyInt / (other) => TinyInt(private()::value / other.toInteger())</lang> |
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let z = this / getInteger(other) |
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TinyInt(z) |
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}</lang> |
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Sample usage (interactive session): |
Sample usage (interactive session): |
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dy>x += 4 |
dy>x += 4 |
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7 :: TinyInt |
TinyInt (7) :: TinyInt |
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dy>x * 2 |
dy>x * 2 |
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Runtime exception Dy601: Overflow. |
Runtime exception Dy601: Overflow. |
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Stack trace: |
Stack trace: ...</pre> |
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at boundsCheck(Dyalect.Debug.Par) in <stdio>, line 13, column 9 |
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at TinyInt(Dyalect.Debug.Par) in <stdio>, line 19, column 29 |
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at *(Dyalect.Debug.Par) in <stdio>, line 37, column 13 |
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at <external code> |
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at TinyInt(Dyalect.Debug.Par) in <stdio>, line 19, column 29 |
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at *(Dyalect.Debug.Par) in <stdio>, line 37, column 13 |
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at <external code></pre> |
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=={{header|E}}== |
=={{header|E}}== |
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