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using System;
namespace jive
{
static public class FuncExtensions
{
static public readonly object mutex = new object();
static public Func<T> memoize<T>(this Func<T> item) where T : class
{
T the_implementation = null;
return () =>
{
if (null == the_implementation)
{
lock (mutex)
{
if (null == the_implementation)
{
the_implementation = item();
}
}
}
return the_implementation;
};
}
}
}
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