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feat(name_generator): add name_generator for unique names modulo a prefix

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Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
This commit is contained in:
Leonardo de Moura 2013-09-26 14:20:11 -07:00
parent e5d312dc18
commit d7ed1560a9
2 changed files with 40 additions and 0 deletions
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13
src/tests/util/name.cpp
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@ -8,6 +8,7 @@ Author: Leonardo de Moura
#include <sstream>
#include "util/test.h"
#include "util/name.h"
#include "util/name_generator.h"
using namespace lean;
static void tst1() {
@ -112,6 +113,17 @@ static void tst8() {
std::cout << u1 << " " << u2 << "\n";
}
static void tst9() {
name_generator g("a");
lean_assert(g.prefix() == "a");
name n0 = g.next();
name n1 = g.next();
name a0(name("a"), 0u);
name a1(name("a"), 1u);
lean_assert(n0 == a0);
lean_assert(n1 == a1);
}
int main() {
tst1();
tst2();
@ -121,5 +133,6 @@ int main() {
tst6();
tst7();
tst8();
tst9();
return has_violations() ? 1 : 0;
}

27
src/util/name_generator.h Normal file
View file

@ -0,0 +1,27 @@
/*
Copyright (c) 2013 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Author: Leonardo de Moura
*/
#pragma once
#include "util/name.h"
namespace lean {
/**
\brief A generator of unique names modulo a prefix.
If the prefix is unique (i.e., it is not the prefix of any other name in the system), then
all generated names are unique.
*/
class name_generator {
name m_prefix;
unsigned m_next_idx;
public:
name_generator(name const & prefix):m_prefix(prefix), m_next_idx(0) { lean_assert(!prefix.is_anonymous()); }
name const & prefix() const { return m_prefix; }
/** \brief Return a unique name modulo \c prefix. */
name next() { name r(m_prefix, m_next_idx); m_next_idx++; return r; }
};
}