Add (commented out) constexpr tests for copy/copy_backwards/copy_if/copy_n. These will be enabled when that part of P0202 is implemented. NFC at this time.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@323137 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/algorithms/alg.modifying.operations/alg.copy/copy.pass.cpp

@@ -10,14 +10,27 @@
 // <algorithm>
 
 // template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
-//   OutIter
+//   constexpr OutIter   // constexpr after C++17
 //   copy(InIter first, InIter last, OutIter result);
 
 #include <algorithm>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
+// #if TEST_STD_VER > 17
+// TEST_CONSTEXPR bool test_constexpr() {
+//     int ia[] = {1, 2, 3, 4, 5};
+//     int ic[] = {6, 6, 6, 6, 6, 6, 6};
+// 
+// 	auto p = std::copy(std::begin(ia), std::end(ia), std::begin(ic));
+// 	return std::equal(std::begin(ia), std::end(ia), std::begin(ic), p)
+// 	    && std::all_of(p, std::end(ic), [](int a){return a == 6;})
+// 	    ;	    
+//     }
+// #endif
+
 template <class InIter, class OutIter>
 void
 test()
@@ -70,4 +83,8 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+// #if TEST_STD_VER > 17
+//     static_assert(test_constexpr());
+// #endif
 }

test/std/algorithms/alg.modifying.operations/alg.copy/copy_backward.pass.cpp

@@ -11,13 +11,28 @@
 
 // template<BidirectionalIterator InIter, BidirectionalIterator OutIter>
 //   requires OutputIterator<OutIter, InIter::reference>
-//   OutIter
+//   constexpr OutIter   // constexpr after C++17
 //   copy_backward(InIter first, InIter last, OutIter result);
 
 #include <algorithm>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
+#include "user_defined_integral.hpp"
+
+// #if TEST_STD_VER > 17
+// TEST_CONSTEXPR bool test_constexpr() {
+//     int ia[] = {1, 2, 3, 4, 5};
+//     int ic[] = {6, 6, 6, 6, 6, 6, 6};
+// 
+// 	size_t N = std::size(ia);
+// 	auto p = std::copy_backward(std::begin(ia), std::end(ia), std::begin(ic) + N);
+// 	return std::equal(std::begin(ic), p, std::begin(ia))
+// 	    && std::all_of(p, std::end(ic), [](int a){return a == 6;})
+// 	    ;	    
+//     }
+// #endif
 
 template <class InIter, class OutIter>
 void
@@ -48,4 +63,8 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+// #if TEST_STD_VER > 17
+//     static_assert(test_constexpr());
+// #endif
 }

test/std/algorithms/alg.modifying.operations/alg.copy/copy_if.pass.cpp

@@ -12,14 +12,27 @@
 // template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter,
 //          Predicate<auto, InIter::value_type> Pred>
 //   requires CopyConstructible<Pred>
-//   OutIter
+//   constexpr OutIter   // constexpr after C++17
 //   copy_if(InIter first, InIter last, OutIter result, Pred pred);
 
 #include <algorithm>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
+// #if TEST_STD_VER > 17
+// TEST_CONSTEXPR bool test_constexpr() {
+//     int ia[] = {2, 4, 6, 8, 6};
+//     int ic[] = {0, 0, 0, 0, 0, 0};
+// 
+// 	auto p = std::copy_if(std::begin(ia), std::end(ia), std::begin(ic), is6);
+// 	return std::all_of(std::begin(ic), p, [](int a){return a == 6;})
+// 	    && std::all_of(p, std::end(ic),   [](int a){return a == 0;})
+// 	    ;	    
+//     }
+// #endif
+
 struct Pred
 {
     bool operator()(int i) {return i % 3 == 0;}
@@ -77,4 +90,8 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+// #if TEST_STD_VER > 17
+//     static_assert(test_constexpr());
+// #endif
 }

test/std/algorithms/alg.modifying.operations/alg.copy/copy_n.pass.cpp

@@ -10,15 +10,28 @@
 // <algorithm>
 
 // template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter>
-//   OutIter
+//   constexpr OutIter   // constexpr after C++17
 //   copy_n(InIter first, InIter::difference_type n, OutIter result);
 
 #include <algorithm>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 #include "user_defined_integral.hpp"
 
+// #if TEST_STD_VER > 17
+// TEST_CONSTEXPR bool test_constexpr() {
+//     int ia[] = {1, 2, 3, 4, 5};
+//     int ic[] = {6, 6, 6, 6, 6, 6, 6};
+// 
+// 	auto p = std::copy_n(std::begin(ia), 4, std::begin(ic));
+// 	return std::equal(std::begin(ic), p, std::begin(ia))
+// 	    && std::all_of(p, std::end(ic), [](int a){return a == 6;})
+// 	    ;	    
+//     }
+// #endif
+
 typedef UserDefinedIntegral<unsigned> UDI;
 
 template <class InIter, class OutIter>
@@ -73,4 +86,8 @@ int main()
     test<const int*, bidirectional_iterator<int*> >();
     test<const int*, random_access_iterator<int*> >();
     test<const int*, int*>();
+
+// #if TEST_STD_VER > 17
+//     static_assert(test_constexpr());
+// #endif
 }