55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/*
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Copyright (c) 2014 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Leonardo de Moura
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*/
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#include "library/bin_app.h"
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namespace lean {
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bool is_bin_app(expr const & t, expr const & f) {
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return is_app(t) && is_app(app_fn(t)) && app_fn(app_fn(t)) == f;
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}
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bool is_bin_app(expr const & t, expr const & f, expr & lhs, expr & rhs) {
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if (is_bin_app(t, f)) {
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lhs = app_arg(app_fn(t));
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rhs = app_arg(t);
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return true;
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} else {
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return false;
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}
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}
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expr mk_bin_rop(expr const & op, expr const & unit, unsigned num_args, expr const * args) {
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if (num_args == 0) {
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return unit;
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} else {
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expr r = args[num_args - 1];
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unsigned i = num_args - 1;
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while (i > 0) {
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--i;
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r = mk_app(op, args[i], r);
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}
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return r;
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}
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}
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expr mk_bin_rop(expr const & op, expr const & unit, std::initializer_list<expr> const & l) {
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return mk_bin_rop(op, unit, l.size(), l.begin());
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}
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expr mk_bin_lop(expr const & op, expr const & unit, unsigned num_args, expr const * args) {
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if (num_args == 0) {
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return unit;
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} else {
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expr r = args[0];
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for (unsigned i = 1; i < num_args; i++) {
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r = mk_app(op, r, args[i]);
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}
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return r;
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}
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}
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expr mk_bin_lop(expr const & op, expr const & unit, std::initializer_list<expr> const & l) {
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return mk_bin_lop(op, unit, l.size(), l.begin());
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}
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}
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