40 lines
1,016 B
C
40 lines
1,016 B
C
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/*
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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 <string>
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#include "kernel/environment.h"
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namespace lean {
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/**
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\brief Return true iff the environment \c env contains the following declarations
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in the namespace 'bit'
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b0 : bit
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b1 : bit
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and the following ones in the namespace 'string'
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ascii : bit -> bit -> bit -> bit -> bit -> bit -> bit -> bit -> char
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empty : string
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str : char -> string -> string
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*/
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bool has_string_decls(environment const & env);
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/**
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\brief Return an expression that encodes the given string using the declarations
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ascii, empty and str.
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\see has_string_decls
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\post *to_string(from_string(s)) == s
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*/
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expr from_string(std::string const & s);
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/**
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\brief If the given expression encodes a string, then convert it back to a string.
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\see from_string
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*/
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optional<std::string> to_string(expr const & e);
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}
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