Type Function Formatter [src]

Creates a Formatter type from a format function. Wrapping data in Formatter(func) causes the data to be formatted using the given function func. func must be of the following form: fn formatExample( data: T, comptime fmt: []const u8, options: std.fmt.FormatOptions, writer: anytype, ) !void;

Prototype

pub fn Formatter(comptime formatFn: anytype) type

Source

  pub fn Formatter(comptime formatFn: anytype) type {
    const Data = @typeInfo(@TypeOf(formatFn)).@"fn".params[0].type.?;
    return struct {
        data: Data,
        pub fn format(
            self: @This(),
            comptime fmt: []const u8,
            options: std.fmt.FormatOptions,
            writer: anytype,
        ) @TypeOf(writer).Error!void {
            try formatFn(self.data, fmt, options, writer);
        }
    };
}  