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| author | Adrian Kummerlaender | 2015-02-19 19:18:48 +0100 |
|---|---|---|
| committer | Adrian Kummerlaender | 2015-02-19 19:18:48 +0100 |
| commit | a07999f7436802f15fc21bebd083006c9e681638 (patch) | |
| tree | 0292012d7f0cc721e6f4a33a7253dbd3373ea551 | |
| parent | 1528d3cc919031d04a2d140a35d9b4cff6633eba (diff) | |
| download | TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.tar TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.tar.gz TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.tar.bz2 TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.tar.lz TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.tar.xz TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.tar.zst TypeAsValue-a07999f7436802f15fc21bebd083006c9e681638.zip | |
Introduced `Branch` and `Else` pair aliases for usage in `Cond`
* pure _syntax sugar_ to improve readability of `Cond` conditionals
| -rw-r--r-- | README.md | 2 | ||||
| -rw-r--r-- | src/conditional/cond.h | 9 | ||||
| -rw-r--r-- | src/function/apply.h | 9 | ||||
| -rw-r--r-- | test.cc | 14 |
4 files changed, 21 insertions, 13 deletions
@@ -20,7 +20,7 @@ This library is a expanded reimplementation of my previous attempt at this probl * guaranteed evaluation during compile time * basic math and logic operations -* conditionals +* conditionals such as `If` and `Cond` * `Cons` constructor for `Pair` type * `List` function as helper for `Pair` based list construction * basic list operators such as `Nth`, `Length`, `Take` and `Append` diff --git a/src/conditional/cond.h b/src/conditional/cond.h index c543449..5f8014f 100644 --- a/src/conditional/cond.h +++ b/src/conditional/cond.h @@ -19,6 +19,15 @@ using Cond = Cdr<Eval< detail::find_variadic<detail::cond_predicate, Branches...> >>; +template < + typename Condition, + typename Result +> +using Branch = Pair<Condition, Result>; + +template <typename Result> +using Else = Branch<Boolean<true>, Result>; + } #endif // TYPEASVALUE_SRC_CONDITIONAL_COND_H_ diff --git a/src/function/apply.h b/src/function/apply.h index 591fa8a..553ae7f 100644 --- a/src/function/apply.h +++ b/src/function/apply.h @@ -18,20 +18,19 @@ template < typename... Arguments > struct Apply : Cond< - Pair< + Branch< GreaterThan<detail::count_placeholders<Arguments...>, Size<2>>, detail::apply_variadic<Function, Arguments...> >, - Pair< + Branch< IsEqualValue<detail::count_placeholders<Arguments...>, Size<2>>, detail::apply_pair<Function, Arguments...> >, - Pair< + Branch< IsEqualValue<detail::count_placeholders<Arguments...>, Size<1>>, detail::apply_single<Function, Arguments...> >, - Pair< - Boolean<true>, + Else< detail::apply_none<Function, Arguments...> > > { }; @@ -239,9 +239,9 @@ static_assert( std::is_same< tav::Int<2>, tav::Cond< - tav::Pair<tav::IsEqualValue<tav::Int<1>, tav::Int<2>>, tav::Int<1>>, - tav::Pair<tav::IsEqualValue<tav::Int<2>, tav::Int<2>>, tav::Int<2>>, - tav::Pair<tav::IsEqualValue<tav::Int<3>, tav::Int<2>>, tav::Int<3>> + tav::Branch<tav::IsEqualValue<tav::Int<1>, tav::Int<2>>, tav::Int<1>>, + tav::Branch<tav::IsEqualValue<tav::Int<2>, tav::Int<2>>, tav::Int<2>>, + tav::Branch<tav::IsEqualValue<tav::Int<3>, tav::Int<2>>, tav::Int<3>> > >::value, "(cond ((= 1 2) 1) ((= 2 2) 2) ((= 3 2) 3)) != 2" @@ -251,10 +251,10 @@ static_assert( std::is_same< tav::Int<-1>, tav::Cond< - tav::Pair<tav::IsEqualValue<tav::Int<1>, tav::Int<2>>, tav::Int< 1>>, - tav::Pair<tav::IsEqualValue<tav::Int<2>, tav::Int<3>>, tav::Int< 2>>, - tav::Pair<tav::IsEqualValue<tav::Int<3>, tav::Int<4>>, tav::Int< 3>>, - tav::Pair<tav::Boolean<true>, tav::Int<-1>> + tav::Branch<tav::IsEqualValue<tav::Int<1>, tav::Int<2>>, tav::Int< 1>>, + tav::Branch<tav::IsEqualValue<tav::Int<2>, tav::Int<3>>, tav::Int< 2>>, + tav::Branch<tav::IsEqualValue<tav::Int<3>, tav::Int<4>>, tav::Int< 3>>, + tav::Else<tav::Int<-1>> > >::value, "(cond ((= 1 2) 1) ((= 2 3) 2) ((= 3 4) 3) (else -1)) != -1" |