mirror of
https://github.com/HenkKalkwater/aoc-2020
synced 2024-11-22 11:05:18 +00:00
30 lines
854 B
D
30 lines
854 B
D
import std.conv;
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import std.exception;
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import std.format;
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class ArgumentException : Exception{
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mixin basicExceptionCtors;
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}
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/**
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* Helper function for implementing
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*
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* Looks at the first argument string, and calls the delegate dgs[i + 1], while making sure nothing
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goes out bounds.
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*
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* Params:
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* args = Reference to string with arguments, usually from main.
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* dgs = list of delegates. Which one will be called depends on args[0]
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*/
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R parts(R)(ref string[] args, R delegate()[] dgs ...) {
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ulong len = dgs.length;
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enforce!ArgumentException(args.length >= 1, "Please provide a part to run as a command line argument");
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int part = to!int(args[0]);
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enforce!ArgumentException(part > 0 && part <= len, "This day supports parts %d to %d".format(1, len));
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// Remove the first argument
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args = args[1..$];
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return dgs[part - 1]();
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}
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