1  //! By convention, root.zig is the root source file when making a library.
 2  //!
 3  //! This file exposes reusable functionality and tests.
 4  //! It does NOT assume global stdout access.
 5  //! Instead, IO is passed in explicitly (Zig 0.16 style).
 6  
 7  const std = @import("std");
 8  
 9  const arithmetic = @cImport({
10      @cInclude("arithmetic/arithmetic.h");
11  });
12  
13  /// Prints a message using a buffered writer.
14  ///
15  /// Stdout is for the actual output of your application.
16  /// For example, if you are implementing gzip, then only the compressed
17  /// bytes should be sent to stdout, not debugging messages.
18  ///
19  /// We use a buffer to reduce syscalls and improve performance.
20  pub fn bufferedPrint(io: std.Io) !void {
21      var stdout_buffer: [1024]u8 = undefined;
22  
23      // Create a buffered writer targeting stdout.
24      var stdout_writer = std.Io.File.stdout().writer(io, &stdout_buffer);
25      const stdout = &stdout_writer.interface;
26  
27      try stdout.print("Run `zig build test` to run the tests.\n", .{});
28  
29      // Always flush buffered output!
30      try stdout.flush();
31  }
32  
33  /// Simple addition function to demonstrate exported library logic.
34  pub fn add(a: i32, b: i32) i32 {
35      return a + b;
36  }
37  
38  pub fn add_c(x: i32, y: i32) i32 {
39      return arithmetic.add(x, y);
40  }
41  
42  test "basic add functionality" {
43      try std.testing.expect(add(3, 7) == 10);
44  }