From 9e3027e5f771c231c7ad9ae869e68cc3e48036ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Carsten=20Gr=C3=A4ser?= <graeser@dune-project.org>
Date: Mon, 14 Nov 2016 16:27:28 +0100
Subject: [PATCH] [test] Check Std::apply() by implementing a tuple
transformation
This checks with a real application example: An implementation
of a tuple transformation.
Maybe we also want to implement our real tuple tranformation
that way, because its easier to read and much shorter.
---
dune/common/test/stdapplytest.cc | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/dune/common/test/stdapplytest.cc b/dune/common/test/stdapplytest.cc
index ccf2370c3..d45169446 100644
--- a/dune/common/test/stdapplytest.cc
+++ b/dune/common/test/stdapplytest.cc
@@ -46,6 +46,17 @@ int main()
test.check(std::get<0>(intTuple) == intTuple0) << "Dune::Std::apply does not properly return references";
+ // transformTuple implemented using Std::apply
+ auto transformTuple = [](auto&& t, auto&& f) {
+ return Dune::Std::apply([&](auto&&... args) {
+ return std::make_tuple((f(std::forward<decltype(args)>(args)))...);
+ }, t);
+ };
+
+ auto t1 = std::make_tuple(1, 0.2);
+ auto t2 = transformTuple(t1, [](auto&& x) { return 1.0/x; });
+
+ test.check(t2 == std::make_tuple(1.0, 5.0)) << "transformTuple implementation based on Dune::Std::apply fails";
return test.exit();
}
--
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