lean2/src/util/name_generator.h

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/*
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; }
};
}