/* PSPP - computes sample statistics.
Copyright (C) 1997-9, 2000 Free Software Foundation, Inc.
- Written by Ben Pfaff <blp@gnu.org>.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
-#ifndef EXPRESSIONS_PRIVATE_H
+#ifndef EXPRESSIONS_PRIVATE_H
#define EXPRESSIONS_PRIVATE_H
#include <assert.h>
#include "public.h"
#include "operations.h"
-enum operation_flags
+enum operation_flags
{
/* Most operations produce a missing output value if any
input value is missing. Setting this bit indicates that
to be non-missing. The operation must have an array
operand and the array must contain `double's. Both
OPF_ABSORB_MISS and OPF_ARRAY_OPERAND must also be set. */
- OPF_MIN_VALID = 002,
+ OPF_MIN_VALID = 002,
/* If set, operation is non-optimizable in general. Unless
combined with OPF_ABSORB_MISS, missing input values are
extern const struct operation operations[];
-/* Tree structured expressions. */
+/* Tree structured expressions. */
/* Atoms. */
-struct number_node
+struct number_node
{
operation_type type; /* OP_number. */
double n;
struct variable_node
{
operation_type type; /* OP_variable. */
- struct variable *v;
+ const struct variable *v;
};
struct integer_node
struct composite_node composite;
};
-union operation_data
+union operation_data
{
operation_type operation;
double number;
struct substring string;
- struct variable *variable;
+ const struct variable *variable;
const struct vector *vector;
struct fmt_spec *format;
int integer;
union any_node *expr_allocate_string (struct expression *e,
struct substring);
union any_node *expr_allocate_variable (struct expression *e,
- struct variable *);
+ const struct variable *);
union any_node *expr_allocate_format (struct expression *e,
const struct fmt_spec *);
union any_node *expr_allocate_vector (struct expression *e,