Implement n3584 - Addressing Tuples by Type

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@186237 91177308-0d34-0410-b5e6-96231b3b80d8

test/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type.pass.cpp

@@ -0,0 +1,52 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <tuple>
+#include <string>
+#include <complex>
+
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    typedef std::complex<float> cf;
+    {
+    auto t1 = std::tuple<int, std::string, cf> { 42, "Hi", { 1,2 }};
+    assert ( std::get<int>(t1) == 42 ); // find at the beginning 
+    assert ( std::get<std::string>(t1) == "Hi" ); // find in the middle
+    assert ( std::get<cf>(t1).real() == 1 ); // find at the end
+    assert ( std::get<cf>(t1).imag() == 2 );
+    }
+    
+    {
+    auto t2 = std::tuple<int, std::string, int, cf> { 42, "Hi", 23, { 1,2 }};
+//  get<int> would fail!
+    assert ( std::get<std::string>(t2) == "Hi" );
+    assert (( std::get<cf>(t2) == cf{ 1,2 } ));
+    }
+    
+    {
+    const std::tuple<int, const int, double, double> p5 { 1, 2, 3.4, 5.6 };
+    const int &i1 = std::get<int>(p5);
+    const int &i2 = std::get<const int>(p5);
+    assert ( i1 == 1 );
+    assert ( i2 == 2 );
+    }
+
+    {
+    typedef std::unique_ptr<int> upint;
+    std::tuple<upint> t(upint(new int(4)));
+    upint p = std::get<upint>(std::move(t)); // get rvalue
+    assert(*p == 4);
+    assert(std::get<0>(t) == nullptr); // has been moved from
+    }
+
+#endif
+}

test/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type1.fail.cpp

@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <tuple>
+#include <string>
+#include <complex>
+
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+	typedef std::complex<float> cf;
+	auto t1 = std::make_tuple<int, std::string> ( 42, "Hi" );
+	assert ( std::get<cf>(t1) == cf {1,2} );	// no such type
+#else
+#error
+#endif
+}

test/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type2.fail.cpp

@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <tuple>
+#include <string>
+#include <complex>
+
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+	typedef std::complex<float> cf;
+	auto t1 = std::make_tuple<int, int, std::string, cf> ( 42, 21, "Hi", { 1,2 } );
+	assert ( std::get<int>(t1) == 42 ); // two ints here
+#else
+#error
+#endif
+}

test/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type3.fail.cpp

@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <tuple>
+#include <string>
+#include <complex>
+
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    typedef std::complex<float> cf;
+    auto t1 = std::make_tuple<double, int, std::string, cf, int> ( 42, 21, "Hi", { 1,2 } );
+    assert ( std::get<int>(t1) == 42 ); // two ints here (one at the end)
+#else
+#error
+#endif
+}

test/utilities/tuple/tuple.tuple/tuple.elem/tuple.by.type4.fail.cpp

@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <tuple>
+#include <string>
+#include <memory>
+
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+	typedef std::unique_ptr<int> upint;
+	std::tuple<upint> t(upint(new int(4)));
+	upint p = std::get<upint>(t);
+#else
+#error
+#endif
+}