make amount non-recursive.

robertshepherdcpp · robertshepherdcpp · commit 005a9e6413f2 · 2023-04-02T19:28:01.000+01:00
diff --git a/amount.hpp b/amount.hpp
@@ -1,5 +1,8 @@
 #pragma once
 
+#include<utility> // std::index_sequence
+#include<cstddef> // std::size_t
+
 namespace mlib
 {
     template<auto T>
@@ -14,11 +17,10 @@ namespace mlib
     template<auto T>
     constexpr auto amount<T>::times(auto&& lambda) const
     {
-        lambda();
-        if constexpr (T - 1 != 0)
+        [] <std::size_t... indexes>(std::index_sequence<indexes...>)
         {
-            amount_t<T - 1>.times(lambda);
-        }
+            (lambda(), void(indexes), ...);
+        }(std::make_index_sequence<T>{});
         return true;
     }
 }; // namespace mlib

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,8 @@`
`1`	`1`	`#pragma once`
`2`	`2`
	`3`	`+#include<utility> // std::index_sequence`
	`4`	`+#include<cstddef> // std::size_t`
	`5`	`+`
`3`	`6`	`namespace mlib`
`4`	`7`	`{`
`5`	`8`	`template<auto T>`
`@@ -14,11 +17,10 @@ namespace mlib`
`14`	`17`	`template<auto T>`
`15`	`18`	`constexpr auto amount<T>::times(auto&& lambda) const`
`16`	`19`	`{`
`17`		`- lambda();`
`18`		`- if constexpr (T - 1 != 0)`
	`20`	`+ [] <std::size_t... indexes>(std::index_sequence<indexes...>)`
`19`	`21`	`{`
`20`		`- amount_t<T - 1>.times(lambda);`
`21`		`- }`
	`22`	`+ (lambda(), void(indexes), ...);`
	`23`	`+ }(std::make_index_sequence<T>{});`
`22`	`24`	`return true;`
`23`	`25`	`}`
`24`	`26`	`}; // namespace mlib`