30 lines
703 B
C++
30 lines
703 B
C++
/*
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Copyright (c) 2013 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 "kernel/kernel.h"
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#include "library/expr_pair.h"
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namespace lean {
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bool is_equality(expr const & e) {
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return is_eq(e) || is_iff(e);
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}
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bool is_equality(expr const & e, expr & lhs, expr & rhs) {
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if (is_eq(e) || is_iff(e)) {
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unsigned num = num_args(e);
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lhs = arg(e, num - 2);
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rhs = arg(e, num - 1);
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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_pair get_equality_args(expr const & e) {
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unsigned num = num_args(e);
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return mk_pair(arg(e, num - 2), arg(e, num - 1));
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}
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}
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