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Groups > comp.lang.c++ > #84083
| From | Ben <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Implementing a two-way Turing Machine tape as an improvement to std::deque |
| Date | 2022-05-13 17:22 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <87bkw1z9k6.fsf@bsb.me.uk> (permalink) |
| References | (9 earlier) <20220513015816.00006f57@reddwarf.jmc> <D7WdnSjo4swvKOD_nZ2dnUU7_81g4p2d@giganews.com> <20220513080247.000077d7@reddwarf.jmc> <t5l090$2f3k$1@news.gegeweb.eu> <AKmdnVy_E98P4OP_nZ2dnUU7_8zNnZ2d@giganews.com> |
olcott <NoOne@NoWhere.com> writes:
> On 5/13/2022 2:10 AM, tth wrote:
>> On 5/13/22 09:02, Mr Flibble wrote:
>>
>>> You cannot implement all of std::deque's member functions meeting
>>> std::deque requirements using your chosen data structure of two
>>> std::vectors.
>> Not with any version of the C language.
>
> Many are implemented
>
> class Tape_Type
> {
> public:
> typedef unsigned char tape_element;
>
> private:
> int Tape_Head = 0; // Can be negative
> std::vector<tape_element> Left; // Stores left expansion
> std::vector<tape_element> Right; // Stores right expansion
>
> tape_element& operator[](int index)
> {
> return index >= 0 ? Right[index] : Left[-index - 1];
> }
>
> public:
> tape_element& front( ) { return Left.back(); }
> tape_element& back() { return Right.back(); }
> void pop_front() { Left.pop_back(); }
> void pop_back() { Right.pop_back(); }
> void push_front(tape_element& E) { Left.push_back(E); }
> void push_back(tape_element& E) { Right.push_back(E); }
> void reserve(unsigned int N)
> { Left.reserve(N); Right.reserve(N); }
>
> My deque is indexed by an integer, >=0 grows the RIGHT with
> Right.push_back() as the index increases above 0 and grows the Left
> with Left.push_back() as the index decreases below 0.
This is not a deque. Test before you post!
--
Ben.
"le génie humain a des limites, quand la bêtise humaine n’en a pas"
Alexandre Dumas (fils)
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Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 17:51 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-12 23:56 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 18:09 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 00:22 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 18:38 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 00:40 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 18:49 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 00:53 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 19:12 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 01:58 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 20:34 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Öö Tiib <ootiib@hot.ee> - 2022-05-12 21:05 -0700
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 08:02 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque tth <tth@none.invalid> - 2022-05-13 09:10 +0200
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-13 10:47 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Ben <ben.usenet@bsb.me.uk> - 2022-05-13 17:22 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Paavo Helde <eesnimi@osa.pri.ee> - 2022-05-13 19:31 +0300
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-13 10:58 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 17:02 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-05-13 12:44 -0700
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Richard Damon <Richard@Damon-Family.org> - 2022-05-12 19:23 -0400
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 18:32 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Ben <ben.usenet@bsb.me.uk> - 2022-05-13 01:06 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 19:55 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 02:01 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-12 20:36 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 08:04 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-13 11:00 -0500
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque Mr Flibble <flibble@reddwarf.jmc> - 2022-05-13 17:04 +0100
Re: Implementing a two-way Turing Machine tape as an improvement to std::deque olcott <NoOne@NoWhere.com> - 2022-05-13 12:05 -0500
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