Simon Brooke
27fd678888
Results are quite disappointing. Resolution on long doubles is nothing like as good as I hoped; they're out by one part in 10^20. All unit tests except one pass, and the one that doesn't is a very minor rounding issue, so I'm calling it good.
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* integer.c
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*
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* functions for integer cells.
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*
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* (c) 2017 Simon Brooke <simon@journeyman.cc>
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* Licensed under GPL version 2.0, or, at your option, any later version.
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*/
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#define _GNU_SOURCE
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#include <math.h>
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#include <stdio.h>
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#include "conspage.h"
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#include "consspaceobject.h"
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#include "read.h"
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/**
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* return the numeric value of this cell, as a C primitive double, not
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* as a cons-space object. Cell may in principle be any kind of number,
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* but only integers and reals are so far implemented.
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*/
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long double numeric_value( struct cons_pointer pointer ) {
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long double result = NAN;
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struct cons_space_object *cell = &pointer2cell( pointer );
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if ( integerp( pointer ) ) {
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result = cell->payload.integer.value * 1.0;
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} else if ( realp( pointer ) ) {
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result = cell->payload.real.value;
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}
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return result;
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}
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/**
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* Allocate an integer cell representing this value and return a cons pointer to it.
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*/
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struct cons_pointer make_integer( long int value ) {
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struct cons_pointer result = allocate_cell( INTEGERTAG );
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struct cons_space_object *cell = &pointer2cell( result );
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cell->payload.integer.value = value;
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dump_object( stderr, result );
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return result;
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}
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