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/*
* Copyright (C) 2000, Imperial College
*
* This file is part of the Imperial College Exact Real Arithmetic Library.
* See the copyright notice included in the distribution for conditions
* of use.
*/
#include <stdio.h>
#include "real.h"
#include "real-impl.h"
/*
* realDelay(f, x) allows for a user to construct a real valued
* closure which reduces to f(x) when forced.
*/
typedef struct {
Delay_Arg x;
Delay_Fun f;
} DelayData;
Real
realDelay(Delay_Fun f, Delay_Arg x)
{
Cls *cls;
DelayData *data;
void delayCont();
if ((data = (DelayData *) malloc(sizeof(DelayData))) == NULL)
Error(FATAL, E_INT, "realDelay", "malloc failed");
data->f = f;
data->x = x;
cls = allocCls(delayCont, data);
cls->tag.isSigned = TRUE;
return (Real) cls;
}
void
delayCont()
{
Cls *cls;
DelayData *data;
cls = (Cls *) POP;
data = (DelayData *) cls->userData;
cls->redirect = (data->f)(data->x);
}
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