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This is an example of documentation generated by ZigDoc, an alternative to Zig's built-in Auto Doc feature. See also examples in other modes/formats. The project being documented here (as the example) is the Zig standard library. Public Function

async

Doc Source

Public Function

std.Io.async

pub fn async(
    io: Io,
    function: anytype,
    args: std.meta.ArgsTuple(@TypeOf(function)),
) Future(@typeInfo(@TypeOf(function)).@"fn".return_type.?)

Calls function with args, such that the return value of the function is not guaranteed to be available until await is called.

function may be called immediately, before async returns. This has weaker guarantees than concurrent, making more portable and reusable.

When this function returns, it is guaranteed that function has already been called and completed, or it has successfully been assigned a unit of concurrency.

Params

io: Io
function
args: std.meta.ArgsTuple(@TypeOf(function))

File

Io.zig:2520

pub fn async(
    io: Io,
    function: anytype,
    args: std.meta.ArgsTuple(@TypeOf(function)),
) Future(@typeInfo(@TypeOf(function)).@"fn".return_type.?) {
    const Result = @typeInfo(@TypeOf(function)).@"fn".return_type.?;
    const Args = @TypeOf(args);
    const TypeErased = struct {
        fn start(context: *const anyopaque, result: *anyopaque) void {
            const args_casted: *const Args = @ptrCast(@alignCast(context));
            const result_casted: *Result = @ptrCast(@alignCast(result));
            result_casted.* = @call(.auto, function, args_casted.*);
        }
    };
    var future: Future(Result) = undefined;
    future.any_future = io.vtable.async(
        io.userdata,
        @ptrCast(&future.result),
        .of(Result),
        @ptrCast(&args),
        .of(Args),
        TypeErased.start,
    );
    return future;
}