Squashed 'third_party/GSL/' content from commit 0cebbd7
Change-Id: Iffb2e32f2f45297ac6d3e82168cd9df4ac5acc2f
git-subtree-dir: third_party/GSL
git-subtree-split: 0cebbd77bfc21acbf1cc05983ad626539eeeb8e0
diff --git a/tests/at_tests.cpp b/tests/at_tests.cpp
new file mode 100644
index 0000000..2f9e999
--- /dev/null
+++ b/tests/at_tests.cpp
@@ -0,0 +1,116 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
+//
+// This code is licensed under the MIT License (MIT).
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include <catch/catch.hpp> // for AssertionHandler, StringRef, CHECK_THROW...
+
+#include <gsl/gsl_util> // for at
+
+#include <array> // for array
+#include <cstddef> // for size_t
+#include <initializer_list> // for initializer_list
+#include <vector> // for vector
+
+namespace gsl {
+struct fail_fast;
+} // namespace gsl
+
+using gsl::fail_fast;
+
+TEST_CASE("static_array")
+{
+ int a[4] = {1, 2, 3, 4};
+ const int(&c_a)[4] = a;
+
+ for (int i = 0; i < 4; ++i) {
+ CHECK(&gsl::at(a, i) == &a[i]);
+ CHECK(&gsl::at(c_a, i) == &a[i]);
+ }
+
+ CHECK_THROWS_AS(gsl::at(a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(a, 4), fail_fast);
+ CHECK_THROWS_AS(gsl::at(c_a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(c_a, 4), fail_fast);
+}
+
+TEST_CASE("std_array")
+{
+ std::array<int, 4> a = {1, 2, 3, 4};
+ const std::array<int, 4>& c_a = a;
+
+ for (int i = 0; i < 4; ++i) {
+ CHECK(&gsl::at(a, i) == &a[static_cast<std::size_t>(i)]);
+ CHECK(&gsl::at(c_a, i) == &a[static_cast<std::size_t>(i)]);
+ }
+
+ CHECK_THROWS_AS(gsl::at(a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(a, 4), fail_fast);
+ CHECK_THROWS_AS(gsl::at(c_a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(c_a, 4), fail_fast);
+}
+
+TEST_CASE("StdVector")
+{
+ std::vector<int> a = {1, 2, 3, 4};
+ const std::vector<int>& c_a = a;
+
+ for (int i = 0; i < 4; ++i) {
+ CHECK(&gsl::at(a, i) == &a[static_cast<std::size_t>(i)]);
+ CHECK(&gsl::at(c_a, i) == &a[static_cast<std::size_t>(i)]);
+ }
+
+ CHECK_THROWS_AS(gsl::at(a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(a, 4), fail_fast);
+ CHECK_THROWS_AS(gsl::at(c_a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(c_a, 4), fail_fast);
+}
+
+TEST_CASE("InitializerList")
+{
+ std::initializer_list<int> a = {1, 2, 3, 4};
+
+ for (int i = 0; i < 4; ++i) {
+ CHECK(gsl::at(a, i) == i + 1);
+ CHECK(gsl::at({1, 2, 3, 4}, i) == i + 1);
+ }
+
+ CHECK_THROWS_AS(gsl::at(a, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at(a, 4), fail_fast);
+ CHECK_THROWS_AS(gsl::at({1, 2, 3, 4}, -1), fail_fast);
+ CHECK_THROWS_AS(gsl::at({1, 2, 3, 4}, 4), fail_fast);
+}
+
+#if !defined(_MSC_VER) || defined(__clang__) || _MSC_VER >= 1910
+static constexpr bool test_constexpr()
+{
+ int a1[4] = {1, 2, 3, 4};
+ const int(&c_a1)[4] = a1;
+ std::array<int, 4> a2 = {1, 2, 3, 4};
+ const std::array<int, 4>& c_a2 = a2;
+
+ for (int i = 0; i < 4; ++i) {
+ if (&gsl::at(a1, i) != &a1[i]) return false;
+ if (&gsl::at(c_a1, i) != &a1[i]) return false;
+ // requires C++17:
+ // if (&gsl::at(a2, i) != &a2[static_cast<std::size_t>(i)]) return false;
+ if (&gsl::at(c_a2, i) != &c_a2[static_cast<std::size_t>(i)]) return false;
+ if (gsl::at({1, 2, 3, 4}, i) != i + 1) return false;
+ }
+
+ return true;
+}
+
+static_assert(test_constexpr(), "FAIL");
+#endif