Add return statement to slice_array and mask_array assignment. Closes PR20614.

This patch just adds the required return statements to slice_array::operator=
and mask_array::operator=.

Tests were added to check that the return value is the same as the object assigned
to.

llvm-svn: 215414

1 files changed, 15 insertions, 0 deletions

diff --git a/libcxx/test/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp b/libcxx/test/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp
index 3bab0dfc9ab..29cb787d009 100644
--- a/libcxx/test/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp
+++ b/libcxx/test/numerics/numarray/template.mask.array/mask.array.assign/mask_array.pass.cpp
@@ -18,6 +18,7 @@
 
 int main()
 {
+    {
     int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
     const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
     bool b1[N1] = {true,  false, false, true,  true,  false,
@@ -48,4 +49,18 @@ int main()
     assert(v1[13] == 13);
     assert(v1[14] == 14);
     assert(v1[15] == 15);
+    }
+    // Test return value of assignment
+    {
+    int a1[] = {0, 1, 2};
+    int a2[] = {3, 4, 5};
+    bool b1[] = {true, false, true};
+    std::valarray<int> v1(a1, 3);
+    std::valarray<int> v2(a2, 3);
+    std::valarray<bool> const vb1(b1, 3);
+    std::mask_array<int> m1 = v1[vb1];
+    std::mask_array<int> const m2 = v2[vb1];
+    std::mask_array<int> const & r = (m1 = m2);
+    assert(&r == &m1);
+    }
 }