imosquera

package main

// Restorer holds a function that can be used
// to restore some previous state.
type Restorer func()

// Restore restores some previous state.
func (r Restorer) Restore() {
	r()
}

adharris

package main

import (
	"database/sql"
	"errors"
	"fmt"
	_ "github.com/bmizerany/pq"
	"os"
	"regexp"
	"strings"

tansengming

# How Clearance / Hoptoad does it
module Clearance
  class << self
    attr_accessor :configuration
  end

  def self.configure
    self.configuration ||= Configuration.new
    yield(configuration)
  end