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534bb4c663
* Added support of not_null<smart_ptr> comparison * The return type of not_null comparison operators is determined using SFINAE #474 * tests for gsl::not_null comparison were added * not_null comparison tests were rewritten to compare pointers to objects located in the same array * not_null<shared_ptr> comparison was simplified
249 lines
8.1 KiB
C++
249 lines
8.1 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/gsl>
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#include <vector>
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#include <memory>
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#include <string>
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using namespace gsl;
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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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// user defined smart pointer with comparison operators returning non bool value
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template <typename T>
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struct CustomPtr
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{
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CustomPtr(T* p) : p_(p) {}
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operator T*() { return p_; }
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bool operator !=(std::nullptr_t)const { return p_ != nullptr; }
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T* p_ = nullptr;
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};
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template <typename T, typename U>
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std::string operator==(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) == reinterpret_cast<const void*>(rhs.p_) ? "true" : "false";
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}
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template <typename T, typename U>
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std::string operator!=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) != reinterpret_cast<const void*>(rhs.p_) ? "true" : "false";
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}
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template <typename T, typename U>
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std::string operator<(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) < reinterpret_cast<const void*>(rhs.p_) ? "true" : "false";
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}
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template <typename T, typename U>
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std::string operator>(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) > reinterpret_cast<const void*>(rhs.p_) ? "true" : "false";
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}
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template <typename T, typename U>
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std::string operator<=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) <= reinterpret_cast<const void*>(rhs.p_) ? "true" : "false";
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}
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template <typename T, typename U>
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std::string operator>=(CustomPtr<T> const& lhs, CustomPtr<U> const& rhs)
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{
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return reinterpret_cast<const void*>(lhs.p_) >= reinterpret_cast<const void*>(rhs.p_) ? "true" : "false";
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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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MyBase base;
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MyDerived derived;
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Unrelated unrelated;
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not_null<Unrelated*> u = &unrelated;
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(void)u;
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not_null<MyDerived*> p = &derived;
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not_null<MyBase*> q = &base;
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q = p; // allowed with heterogeneous copy ctor
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CHECK(q == p);
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#ifdef CONFIRM_COMPILATION_ERRORS
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q = u; // no viable conversion possible between MyBase* and Unrelated*
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p = q; // not possible to implicitly convert MyBase* to MyDerived*
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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(reinterpret_cast<void*>(p.get()) == reinterpret_cast<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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TEST(TestNotNullRawPointerComparison)
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{
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int ints[2] = {42, 43};
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int* p1 = &ints[0];
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const int* p2 = &ints[1];
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using NotNull1 = not_null<decltype(p1)>;
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using NotNull2 = not_null<decltype(p2)>;
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CHECK((NotNull1(p1) == NotNull1(p1)) == true);
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CHECK((NotNull1(p1) == NotNull2(p2)) == false);
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CHECK((NotNull1(p1) != NotNull1(p1)) == false);
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CHECK((NotNull1(p1) != NotNull2(p2)) == true);
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CHECK((NotNull1(p1) < NotNull1(p1)) == false);
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CHECK((NotNull1(p1) < NotNull2(p2)) == (p1 < p2));
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CHECK((NotNull2(p2) < NotNull1(p1)) == (p2 < p1));
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CHECK((NotNull1(p1) > NotNull1(p1)) == false);
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CHECK((NotNull1(p1) > NotNull2(p2)) == (p1 > p2));
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CHECK((NotNull2(p2) > NotNull1(p1)) == (p2 > p1));
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CHECK((NotNull1(p1) <= NotNull1(p1)) == true);
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CHECK((NotNull1(p1) <= NotNull2(p2)) == (p1 <= p2));
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CHECK((NotNull2(p2) <= NotNull1(p1)) == (p2 <= p1));
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CHECK((NotNull1(p1) >= NotNull1(p1)) == true);
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CHECK((NotNull1(p1) >= NotNull2(p2)) == (p1 >= p2));
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CHECK((NotNull2(p2) >= NotNull1(p1)) == (p2 >= p1));
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}
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TEST(TestNotNullSharedPtrComparison)
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{
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auto sp1 = std::make_shared<int>(42);
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auto sp2 = std::make_shared<const int>(43);
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using NotNullSp1 = not_null<decltype(sp1)>;
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using NotNullSp2 = not_null<decltype(sp2)>;
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CHECK((NotNullSp1(sp1) == NotNullSp1(sp1)) == true);
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CHECK((NotNullSp1(sp1) == NotNullSp2(sp2)) == false);
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CHECK((NotNullSp1(sp1) != NotNullSp1(sp1)) == false);
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CHECK((NotNullSp1(sp1) != NotNullSp2(sp2)) == true);
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CHECK((NotNullSp1(sp1) < NotNullSp1(sp1)) == false);
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CHECK((NotNullSp1(sp1) < NotNullSp2(sp2)) == (sp1 < sp2));
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CHECK((NotNullSp2(sp2) < NotNullSp1(sp1)) == (sp2 < sp1));
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CHECK((NotNullSp1(sp1) > NotNullSp1(sp1)) == false);
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CHECK((NotNullSp1(sp1) > NotNullSp2(sp2)) == (sp1 > sp2));
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CHECK((NotNullSp2(sp2) > NotNullSp1(sp1)) == (sp2 > sp1));
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CHECK((NotNullSp1(sp1) <= NotNullSp1(sp1)) == true);
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CHECK((NotNullSp1(sp1) <= NotNullSp2(sp2)) == (sp1 <= sp2));
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CHECK((NotNullSp2(sp2) <= NotNullSp1(sp1)) == (sp2 <= sp1));
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CHECK((NotNullSp1(sp1) >= NotNullSp1(sp1)) == true);
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CHECK((NotNullSp1(sp1) >= NotNullSp2(sp2)) == (sp1 >= sp2));
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CHECK((NotNullSp2(sp2) >= NotNullSp1(sp1)) == (sp2 >= sp1));
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}
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TEST(TestNotNullCustomPtrComparison)
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{
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int ints[2] = { 42, 43 };
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CustomPtr<int> p1(&ints[0]);
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CustomPtr<const int> p2(&ints[1]);
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using NotNull1 = not_null<decltype(p1)>;
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using NotNull2 = not_null<decltype(p2)>;
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CHECK((NotNull1(p1) == NotNull1(p1)) == "true");
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CHECK((NotNull1(p1) == NotNull2(p2)) == "false");
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CHECK((NotNull1(p1) != NotNull1(p1)) == "false");
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CHECK((NotNull1(p1) != NotNull2(p2)) == "true");
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CHECK((NotNull1(p1) < NotNull1(p1)) == "false");
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CHECK((NotNull1(p1) < NotNull2(p2)) == (p1 < p2));
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CHECK((NotNull2(p2) < NotNull1(p1)) == (p2 < p1));
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CHECK((NotNull1(p1) > NotNull1(p1)) == "false");
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CHECK((NotNull1(p1) > NotNull2(p2)) == (p1 > p2));
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CHECK((NotNull2(p2) > NotNull1(p1)) == (p2 > p1));
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CHECK((NotNull1(p1) <= NotNull1(p1)) == "true");
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CHECK((NotNull1(p1) <= NotNull2(p2)) == (p1 <= p2));
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CHECK((NotNull2(p2) <= NotNull1(p1)) == (p2 <= p1));
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CHECK((NotNull1(p1) >= NotNull1(p1)) == "true");
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CHECK((NotNull1(p1) >= NotNull2(p2)) == (p1 >= p2));
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CHECK((NotNull2(p2) >= NotNull1(p1)) == (p2 >= p1));
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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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