mirror of
https://github.com/microsoft/GSL.git
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136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <gtest/gtest.h>
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#include <gsl/util> // for at
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#include <array> // for array
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#include <cstddef> // for size_t
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#include <initializer_list> // for initializer_list
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#include <vector> // for vector
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namespace
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{
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static constexpr char deathstring[] = "Expected Death";
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}
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TEST(at_tests, static_array)
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{
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int a[4] = {1, 2, 3, 4};
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const int(&c_a)[4] = a;
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for (int i = 0; i < 4; ++i) {
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EXPECT_TRUE(&gsl::at(a, i) == &a[i]);
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EXPECT_TRUE(&gsl::at(c_a, i) == &a[i]);
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}
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std::set_terminate([] {
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std::cerr << "Expected Death. static_array";
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std::abort();
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});
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EXPECT_DEATH(gsl::at(a, -1), deathstring);
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EXPECT_DEATH(gsl::at(a, 4), deathstring);
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EXPECT_DEATH(gsl::at(c_a, -1), deathstring);
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EXPECT_DEATH(gsl::at(c_a, 4), deathstring);
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}
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TEST(at_tests, std_array)
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{
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std::array<int, 4> a = {1, 2, 3, 4};
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const std::array<int, 4>& c_a = a;
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for (int i = 0; i < 4; ++i) {
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EXPECT_TRUE(&gsl::at(a, i) == &a[static_cast<std::size_t>(i)]);
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EXPECT_TRUE(&gsl::at(c_a, i) == &a[static_cast<std::size_t>(i)]);
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}
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std::set_terminate([] {
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std::cerr << "Expected Death. std_array";
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std::abort();
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});
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EXPECT_DEATH(gsl::at(a, -1), deathstring);
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EXPECT_DEATH(gsl::at(a, 4), deathstring);
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EXPECT_DEATH(gsl::at(c_a, -1), deathstring);
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EXPECT_DEATH(gsl::at(c_a, 4), deathstring);
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}
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TEST(at_tests, std_vector)
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{
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std::vector<int> a = {1, 2, 3, 4};
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const std::vector<int>& c_a = a;
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for (int i = 0; i < 4; ++i) {
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EXPECT_TRUE(&gsl::at(a, i) == &a[static_cast<std::size_t>(i)]);
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EXPECT_TRUE(&gsl::at(c_a, i) == &a[static_cast<std::size_t>(i)]);
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}
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std::set_terminate([] {
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std::cerr << "Expected Death. std_vector";
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std::abort();
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});
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EXPECT_DEATH(gsl::at(a, -1), deathstring);
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EXPECT_DEATH(gsl::at(a, 4), deathstring);
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EXPECT_DEATH(gsl::at(c_a, -1), deathstring);
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EXPECT_DEATH(gsl::at(c_a, 4), deathstring);
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}
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TEST(at_tests, InitializerList)
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{
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const std::initializer_list<int> a = {1, 2, 3, 4};
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for (int i = 0; i < 4; ++i) {
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EXPECT_TRUE(gsl::at(a, i) == i + 1);
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EXPECT_TRUE(gsl::at({1, 2, 3, 4}, i) == i + 1);
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}
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std::set_terminate([] {
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std::cerr << "Expected Death. InitializerList";
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std::abort();
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});
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EXPECT_DEATH(gsl::at(a, -1), deathstring);
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EXPECT_DEATH(gsl::at(a, 4), deathstring);
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EXPECT_DEATH(gsl::at({1, 2, 3, 4}, -1), deathstring);
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EXPECT_DEATH(gsl::at({1, 2, 3, 4}, 4), deathstring);
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}
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#if !defined(_MSC_VER) || defined(__clang__) || _MSC_VER >= 1910
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static constexpr bool test_constexpr()
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{
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int a1[4] = {1, 2, 3, 4};
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const int(&c_a1)[4] = a1;
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std::array<int, 4> a2 = {1, 2, 3, 4};
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const std::array<int, 4>& c_a2 = a2;
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for (int i = 0; i < 4; ++i) {
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if (&gsl::at(a1, i) != &a1[i]) return false;
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if (&gsl::at(c_a1, i) != &a1[i]) return false;
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// requires C++17:
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// if (&gsl::at(a2, i) != &a2[static_cast<std::size_t>(i)]) return false;
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if (&gsl::at(c_a2, i) != &c_a2[static_cast<std::size_t>(i)]) return false;
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if (gsl::at({1, 2, 3, 4}, i) != i + 1) return false;
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}
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return true;
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}
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static_assert(test_constexpr(), "FAIL");
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#endif
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