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https://github.com/ratfactor/ziglings
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88e9e785ef
Add the check-exercises.py tool in the new tools directory. It is used to check that the exercises are correctly formatted, printing on stderr the invalid ones and the diff in the unified format. Update the exercises that don't use the canonical zig fmt format. Update some patches that cause the generated zig file to be incorrectly formatted.
55 lines
1.8 KiB
Zig
55 lines
1.8 KiB
Zig
//
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// One of the more common uses of 'comptime' function parameters is
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// passing a type to a function:
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//
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// fn foo(comptime MyType: type) void { ... }
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//
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// In fact, types are ONLY available at compile time, so the
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// 'comptime' keyword is required here.
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//
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// Please take a moment to put on the wizard hat which has been
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// provided for you. We're about to use this ability to implement
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// a generic function.
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//
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const print = @import("std").debug.print;
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pub fn main() void {
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// Here we declare arrays of three different types and sizes
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// at compile time from a function call. Neat!
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const s1 = makeSequence(u8, 3); // creates a [3]u8
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const s2 = makeSequence(u32, 5); // creates a [5]u32
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const s3 = makeSequence(i64, 7); // creates a [7]i64
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print("s1={any}, s2={any}, s3={any}\n", .{ s1, s2, s3 });
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}
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// This function is pretty wild because it executes at runtime
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// and is part of the final compiled program. The function is
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// compiled with unchanging data sizes and types.
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//
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// And yet it ALSO allows for different sizes and types. This
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// seems paradoxical. How could both things be true?
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//
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// To accomplish this, the Zig compiler actually generates a
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// separate copy of the function for every size/type combination!
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// So in this case, three different functions will be generated
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// for you, each with machine code that handles that specific
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// data size and type.
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//
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// Please fix this function so that the 'size' parameter:
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//
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// 1) Is guaranteed to be known at compile time.
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// 2) Sets the size of the array of type T (which is the
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// sequence we're creating and returning).
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//
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fn makeSequence(comptime T: type, ??? size: usize) [???]T {
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var sequence: [???]T = undefined;
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var i: usize = 0;
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while (i < size) : (i += 1) {
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sequence[i] = @intCast(T, i) + 1;
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}
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return sequence;
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}
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