const std = @import("std");

pub fn Lazy(comptime T: type, comptime init_fn: std.meta.DeclEnum(T)) type {
    return struct {
        const Self = @This();

        value: ?T = null,

        pub fn get(self: *Self) *T {
            return if (self.value) |*v| v else blk: {
                self.value = @field(T, @tagName(init_fn))();
                break :blk &self.value.?;
            };
        }
    };
}

pub fn lazy(comptime T: type, comptime init_fn: std.meta.DeclEnum(T)) Lazy(T, init_fn) {
    return .{};
}