mirror of
https://github.com/microsoft/GSL.git
synced 2024-11-03 17:56:43 -05:00
ebab8cab7f
* initializer_list overload returns by value to avoid lifetime issues * generic overload uses expression SFINAE to work with any type that has member size() and operator[], which notably includes const/non-const vector and array. * Add test coverage for const objects, rvalue initializer_lists, and constexpr usage. Fixes #357.
115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// 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 <UnitTest++/UnitTest++.h>
|
|
#include <gsl/gsl>
|
|
#include <vector>
|
|
#include <initializer_list>
|
|
|
|
using gsl::fail_fast;
|
|
|
|
SUITE(at_tests)
|
|
{
|
|
TEST(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_THROW(gsl::at(a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(a, 4), fail_fast);
|
|
CHECK_THROW(gsl::at(c_a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(c_a, 4), fail_fast);
|
|
}
|
|
|
|
TEST(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[i]);
|
|
CHECK(&gsl::at(c_a, i) == &a[i]);
|
|
}
|
|
|
|
CHECK_THROW(gsl::at(a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(a, 4), fail_fast);
|
|
CHECK_THROW(gsl::at(c_a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(c_a, 4), fail_fast);
|
|
}
|
|
|
|
TEST(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[i]);
|
|
CHECK(&gsl::at(c_a, i) == &a[i]);
|
|
}
|
|
|
|
CHECK_THROW(gsl::at(a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(a, 4), fail_fast);
|
|
CHECK_THROW(gsl::at(c_a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(c_a, 4), fail_fast);
|
|
}
|
|
|
|
TEST(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_THROW(gsl::at(a, -1), fail_fast);
|
|
CHECK_THROW(gsl::at(a, 4), fail_fast);
|
|
CHECK_THROW(gsl::at({1,2,3,4}, -1), fail_fast);
|
|
CHECK_THROW(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;
|
|
if (&gsl::at(c_a2, i) != &c_a2[i]) return false;
|
|
if (gsl::at({1,2,3,4}, i) != i+1) return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static_assert(test_constexpr(), "FAIL");
|
|
#endif
|
|
|
|
int main()
|
|
{
|
|
return UnitTest::RunAllTests();
|
|
}
|