diff options
| author | Adrian Kummerlaender | 2015-02-23 19:03:16 +0100 |
|---|---|---|
| committer | Adrian Kummerlaender | 2015-02-23 19:03:16 +0100 |
| commit | 0dde43edac6817c3f0a237d25c2054c0ee75926c (patch) | |
| tree | 037d04fd230f5aa613b6e8b3030e93973f5566b9 /example/turing/src/tape.h | |
| parent | 41b63eff7f76e6574ef238f821dad0212a619c2a (diff) | |
| download | TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.tar TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.tar.gz TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.tar.bz2 TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.tar.lz TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.tar.xz TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.tar.zst TypeAsValue-0dde43edac6817c3f0a237d25c2054c0ee75926c.zip | |
Added binary incrementer state table to Turing machine example
* reintroduced `BLANK` as the _BLANK_ symbol
* fixed implicit tape expansion in `tape::readSymbol`
Diffstat (limited to 'example/turing/src/tape.h')
| -rw-r--r-- | example/turing/src/tape.h | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/example/turing/src/tape.h b/example/turing/src/tape.h index 39814d8..4f79bd9 100644 --- a/example/turing/src/tape.h +++ b/example/turing/src/tape.h @@ -10,6 +10,12 @@ namespace machine { namespace tape { +struct BLANK { + typedef BLANK type; + + static constexpr char value{'\0'}; +}; + // (define (readSymbol position tape) // (if (= (length tape) position) // '() @@ -18,11 +24,11 @@ template < typename Position, typename Tape > -using readSymbol = tav::If< - tav::IsEqualValue<tav::Length<Tape>, Position>, - void, - tav::Nth<Position, Tape> ->; +using readSymbol = tav::Eval<tav::If< + tav::LowerThan<Position, tav::Length<Tape>>, + tav::utility::defer_eval<tav::Nth, Position, Tape>, + BLANK +>>; // (define (writeSymbol position symbol tape) // (if (= (length tape) position) |