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const std = @import("std");
const Allocator = std.mem.Allocator;
const expect = std.testing.expect;
test "using an allocator" {
var buffer: [100]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(&buffer);
const allocator = fba.allocator();
const result = try concat(allocator, "foo", "bar");
try expect(std.mem.eql(u8, "foobar", result));
}
fn concat(allocator: Allocator, a: []const u8, b: []const u8) ![]u8 {
const result = try allocator.alloc(u8, a.len + b.len);
@memcpy(result[0..a.len], a);
@memcpy(result[a.len..], b);
return result;
}
// test
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