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2b6d90436f
This is in accordance with the GSL.View guidance on not_null and maybe_null types in the CppCoreGuidelines document.
96 lines
2.6 KiB
C++
96 lines
2.6 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 <UnitTest++/UnitTest++.h>
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#include <gsl.h>
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#include <vector>
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using namespace Guide;
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struct MyBase {};
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struct MyDerived : public MyBase {};
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struct Unrelated {};
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// stand-in for a user-defined ref-counted class
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template<typename T>
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struct RefCounted
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{
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RefCounted(T* p) : p_(p) {}
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operator T*() { return p_; }
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T* p_;
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};
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SUITE(NotNullTests)
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{
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bool helper(not_null<int*> p)
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{
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return *p == 12;
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}
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TEST(TestNotNullConstructors)
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{
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#ifdef CONFIRM_COMPILATION_ERRORS
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not_null<int*> p = nullptr; // yay...does not compile!
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not_null<std::vector<char>*> p = 0; // yay...does not compile!
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not_null<int*> p; // yay...does not compile!
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std::unique_ptr<int> up = std::make_unique<int>(120);
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not_null<int*> p = up;
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// Forbid non-nullptr assignable types
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not_null<std::vector<int>> f(std::vector<int>{1});
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not_null<int> z(10);
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not_null<std::vector<int>> y({1,2});
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#endif
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int i = 12;
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auto rp = RefCounted<int>(&i);
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not_null<int*> p(rp);
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CHECK(p.get() == &i);
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not_null<std::shared_ptr<int>> x(std::make_shared<int>(10)); // shared_ptr<int> is nullptr assignable
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}
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TEST(TestNotNullCasting)
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{
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MyDerived derived;
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not_null<MyDerived*> p = &derived;
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not_null<MyBase*> q = p;
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CHECK(q == p);
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#ifdef CONFIRM_COMPILATION_ERRORS
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not_null<Unrelated*> r = p;
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not_null<Unrelated*> s = reinterpret_cast<Unrelated*>(p);
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#endif
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not_null<Unrelated*> t = reinterpret_cast<Unrelated*>(p.get());
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CHECK((void*)p.get() == (void*)t.get());
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}
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TEST(TestNotNullAssignment)
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{
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int i = 12;
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not_null<int*> p = &i;
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CHECK(helper(p));
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int* q = nullptr;
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CHECK_THROW(p = q, fail_fast);
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}
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}
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int main(int, const char *[])
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{
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return UnitTest::RunAllTests();
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}
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