79 lines
2.4 KiB
C++
79 lines
2.4 KiB
C++
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/*
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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 "builtin.h"
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namespace lean {
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class bool_type_value : public value {
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public:
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static char const * g_kind;
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virtual ~bool_type_value() {}
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char const * kind() const { return g_kind; }
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virtual expr get_type() const { return type(level()); }
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virtual bool normalize(unsigned num_args, expr const * args, expr & r) const { return false; }
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virtual bool operator==(value const & other) const { return other.kind() == kind(); }
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virtual void display(std::ostream & out) const { out << "bool"; }
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virtual format pp() const { return format("bool"); }
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virtual unsigned hash() const { return 17; }
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};
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char const * bool_type_value::g_kind = "bool";
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expr bool_type() {
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static thread_local expr r;
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if (!r)
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r = to_expr(*(new bool_type_value()));
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return r;
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}
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bool is_bool_type(expr const & e) {
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return is_value(e) && to_value(e).kind() == bool_type_value::g_kind;
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}
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class bool_value_value : public value {
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bool m_val;
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public:
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static char const * g_kind;
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bool_value_value(bool v):m_val(v) {}
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virtual ~bool_value_value() {}
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char const * kind() const { return g_kind; }
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virtual expr get_type() const { return bool_type(); }
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virtual bool normalize(unsigned num_args, expr const * args, expr & r) const { return false; }
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virtual bool operator==(value const & other) const {
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return other.kind() == kind() && m_val == static_cast<bool_value_value const &>(other).m_val;
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}
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virtual void display(std::ostream & out) const { out << (m_val ? "true" : "false"); }
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virtual format pp() const { return format(m_val ? "true" : "false"); }
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virtual unsigned hash() const { return m_val ? 3 : 5; }
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bool get_val() const { return m_val; }
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};
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char const * bool_value_value::g_kind = "bool_value";
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expr bool_value(bool v) {
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return to_expr(*(new bool_value_value(v)));
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}
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bool is_bool_value(expr const & e) {
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return is_value(e) && to_value(e).kind() == bool_value_value::g_kind;
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}
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bool to_bool(expr const & e) {
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lean_assert(is_bool_value(e));
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return static_cast<bool_value_value const &>(to_value(e)).get_val();
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}
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bool is_true(expr const & e) {
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return is_bool_value(e) && to_bool(e);
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}
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bool is_false(expr const & e) {
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return is_bool_value(e) && !to_bool(e);
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}
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}
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