47 lines
1.0 KiB
D
47 lines
1.0 KiB
D
// ****** this, alias, alias ... this keywords ******
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// Converting Celcius to Fahrenheit
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class CelciusToFahrenheit {
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float celcius;
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// init
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this(float celcius) {
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this.celcius = celcius;
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}
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// convert to Fahrenheit
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double convert() {
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return double(9.0/5.0 * celcius + 32.0);
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}
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// enable automatic conversion of CelciusToFahrenheit objects to double
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alias convert this;
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}
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// print temperature announcement for the day
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void announce(string day, double temp) {
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import std.stdio: writeln;
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writeln("Temperature for ", day, " is ", temp, "F.");
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}
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void main() {
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CelciusToFahrenheit monday = new CelciusToFahrenheit(36.0);
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announce("Monday", monday);
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// creating an alias of CelciusToFahrenheit class
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// similar to 'typedef' in C, 'using' in C++11
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alias CtoF = CelciusToFahrenheit; // also: alias CelciusToFahrenheit CtoF;
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CtoF tuesday = new CtoF(24.5);
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announce("Tuesday", tuesday);
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// imitating rust's data types:
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alias u8 = ubyte;
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alias u16 = ushort;
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alias u32 = uint;
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alias f32 = float;
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alias f64 = double;
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// etc...
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}
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