Changed `tav::Apply` implementation selection to template alias

* there is no reason to differ from the rest of the library and use inheritance in this instance
* added link to blog article on the _Scheme metaphor_ to `README.md`

5 files changed, 12 insertions, 10 deletions

diff --git a/README.md b/README.md
index 59b07ec..8ffbb55 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@
 
 This library is a expanded reimplementation of my previous attempt at this problem: [ConstList](https://github.com/KnairdA/ConstList). As detailed in the appropriate [blog article](http://blog.kummerlaender.eu/article/a_look_at_compile_time_computation_in_cpp/) the mixed approach between generic lambda expressions, `constexpr` marked functions and template metaprogramming doesn't offer sufficient flexibility which led me to approach compile time computation in a slightly different manner via this new library. As one might notice this boils down to using _Scheme_ as a metaphor for C++ template metaprogramming. In fact all test cases and examples are documented by representing their logic in _Scheme_.
 
+Furthermore an overview of this library alongside some background information is available in the form of a blog article on [using _Scheme_ as a metaphor for template metaprogramming](http://blog.kummerlaender.eu/article/using_scheme_as_a_metaphor_for_template_metaprogramming/).
+
 ## Example
 
 	// λ (length (filter odd? (list 1 2 3)))
diff --git a/example/turing/turing.cc b/example/turing/turing.cc
index 720697a..070bc16 100644
--- a/example/turing/turing.cc
+++ b/example/turing/turing.cc
@@ -9,7 +9,7 @@ using BLANK = machine::tape::BLANK;
 
 // (define mirror (list (list 1 1 0 2 'R') [...]))
 using mirror = tav::List<
-//            [state]       [read]       [write]      [next state]  [head movement]
+	//        [state]       [read]       [write]      [next state]  [head movement]
 	tav::List<tav::Size<1>, tav::Int<1>, tav::Int<0>, tav::Size<2>, tav::Char<'R'>>,
 	tav::List<tav::Size<1>, tav::Int<0>, tav::Int<0>, void,         tav::Char<'N'> >,
 	tav::List<tav::Size<2>, tav::Int<1>, tav::Int<1>, tav::Size<2>, tav::Char<'R'>>,
@@ -24,7 +24,7 @@ using mirror = tav::List<
 
 // (define busy_beaver (list (list 'A' 0 1 'B' 'R') [...]))
 using busy_beaver = tav::List<
-//            [state]         [read]       [write]      [next state]    [head movement]
+	//        [state]         [read]       [write]      [next state]    [head movement]
 	tav::List<tav::Char<'A'>, tav::Int<0>, tav::Int<1>, tav::Char<'B'>, tav::Char<'R'>>,
 	tav::List<tav::Char<'A'>, tav::Int<1>, tav::Int<1>, tav::Char<'C'>, tav::Char<'L'> >,
 	tav::List<tav::Char<'B'>, tav::Int<0>, tav::Int<1>, tav::Char<'A'>, tav::Char<'L'> >,
@@ -35,7 +35,7 @@ using busy_beaver = tav::List<
 
 // (define binary_increment (list (list 0 '() '() 1 'L') [...]))
 using binary_increment = tav::List<
-//            [state]       [read]               [write]              [next state]  [head movement]
+	//        [state]       [read]               [write]              [next state]  [head movement]
 	tav::List<tav::Size<0>, BLANK,               BLANK,               tav::Size<1>, tav::Char<'L'>>,
 	tav::List<tav::Size<0>, tav::Boolean<false>, tav::Boolean<false>, tav::Size<0>, tav::Char<'R'>>,
 	tav::List<tav::Size<0>, tav::Boolean<true>,  tav::Boolean<true>,  tav::Size<0>, tav::Char<'R'>>,
diff --git a/src/function/apply.h b/src/function/apply.h
index 553ae7f..402b654 100644
--- a/src/function/apply.h
+++ b/src/function/apply.h
@@ -17,7 +17,7 @@ template <
 	template<typename...> class Function,
 	typename...                 Arguments
 >
-struct Apply : Cond<
+using Apply = Cond<
 	Branch<
 		GreaterThan<detail::count_placeholders<Arguments...>, Size<2>>,
 		detail::apply_variadic<Function, Arguments...>
@@ -33,7 +33,7 @@ struct Apply : Cond<
 	Else<
 		detail::apply_none<Function, Arguments...>
 	>
-> { };
+>;
 
 }
 
diff --git a/src/function/detail/apply.h b/src/function/detail/apply.h
index c06fe68..4b550e6 100644
--- a/src/function/detail/apply.h
+++ b/src/function/detail/apply.h
@@ -33,7 +33,7 @@ template <
 	template<typename...> class Function,
 	typename...                 Arguments
 >
-struct apply_single : apply_variadic<Function, Arguments...> {
+struct apply_single {
 	template <typename Partial0>
 	using function = typename apply_variadic<
 		Function,
@@ -45,7 +45,7 @@ template <
 	template<typename...> class Function,
 	typename...                 Arguments
 >
-struct apply_pair : apply_variadic<Function, Arguments...> {
+struct apply_pair {
 	template <typename Partial0, typename Partial1>
 	using function = typename apply_variadic<
 		Function,
diff --git a/src/function/detail/placeholder.h b/src/function/detail/placeholder.h
index 8105de5..00818b7 100644
--- a/src/function/detail/placeholder.h
+++ b/src/function/detail/placeholder.h
@@ -13,7 +13,7 @@ namespace detail {
 
 struct placeholder_tag { };
 
-template <int Index>
+template <std::size_t Index>
 struct placeholder : placeholder_tag { };
 
 template <typename Type>
@@ -28,8 +28,8 @@ struct resolve_placeholder {
 };
 
 template <
-	typename Partials,
-	int      Index
+	typename    Partials,
+	std::size_t Index
 >
 struct resolve_placeholder<Partials, placeholder<Index>> {
 	typedef Nth<Size<Index>, Partials> type;