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///////////////////////////////////////////////////////////////////////////////
//
// 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 <gsl/pointers> // for not_null, operator<, operator<=, operator>
#include <gtest/gtest.h>
#include <type_traits> // for declval
#include "deathTestCommon.h"
using namespace gsl;
#if __cplusplus >= 201703l
using std::void_t;
#else // __cplusplus >= 201703l
template <class...>
using void_t = void;
#endif // __cplusplus < 201703l
// stand-in for a user-defined ref-counted class
template <typename T>
struct RefCounted
{
RefCounted(T* p) : p_(p) {}
operator T*() { return p_; }
T* p_;
};
namespace
{
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool helper(not_null<int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool helper_const(not_null<const int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool strict_helper(strict_not_null<int*> p) { return *p == 12; }
// clang-format off
GSL_SUPPRESS(f.4) // NO-FORMAT: attribute
// clang-format on
bool strict_helper_const(strict_not_null<const int*> p) { return *p == 12; }
int* return_pointer() { return nullptr; }
} // namespace
template <typename U, typename = void>
static constexpr bool CtorCompilesFor_A = false;
template <typename U>
static constexpr bool
CtorCompilesFor_A<U, void_t<decltype(gsl::strict_not_null<void*>{std::declval<U>()})>> = true;
template <typename U, int N, typename = void>
static constexpr bool CtorCompilesFor_B = false;
template <typename U, int N>
static constexpr bool CtorCompilesFor_B<U, N, void_t<decltype(gsl::strict_not_null<U>{N})>> = true;
template <typename U, typename = void>
static constexpr bool DefaultCtorCompilesFor = false;
template <typename U>
static constexpr bool DefaultCtorCompilesFor<U, void_t<decltype(gsl::strict_not_null<U>{})>> = true;
template <typename U, typename = void>
static constexpr bool CtorCompilesFor_C = false;
template <typename U>
static constexpr bool CtorCompilesFor_C<
U, void_t<decltype(gsl::strict_not_null<U*>{std::declval<std::unique_ptr<U>>()})>> = true;
TEST(strict_notnull_tests, TestStrictNotNullConstructors)
{
{
static_assert(CtorCompilesFor_A<void*>, "CtorCompilesFor_A<void*>");
static_assert(!CtorCompilesFor_A<std::nullptr_t>, "!CtorCompilesFor_A<std::nullptr_t>");
static_assert(!CtorCompilesFor_B<void*, 0>, "!CtorCompilesFor_B<void*, 0>");
static_assert(!DefaultCtorCompilesFor<void*>, "!DefaultCtorCompilesFor<void*>");
static_assert(!CtorCompilesFor_C<int>, "CtorCompilesFor_C<int>");
#ifdef CONFIRM_COMPILATION_ERRORS
// Forbid non-nullptr assignable types
strict_not_null<std::vector<int>> f(std::vector<int>{1});
strict_not_null<int> z(10);
strict_not_null<std::vector<int>> y({1, 2});
#endif
}
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestNotNullConstructors";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
{
// from shared pointer
int i = 12;
auto rp = RefCounted<int>(&i);
strict_not_null<int*> p(rp);
EXPECT_TRUE(p.get() == &i);
strict_not_null<std::shared_ptr<int>> x(
std::make_shared<int>(10)); // shared_ptr<int> is nullptr assignable
int* pi = nullptr;
EXPECT_DEATH((strict_not_null<decltype(pi)>(pi)), expected);
}
{
// from unique pointer
strict_not_null<std::unique_ptr<int>> x(
std::make_unique<int>(10)); // unique_ptr<int> is nullptr assignable
EXPECT_DEATH((strict_not_null<std::unique_ptr<int>>(std::unique_ptr<int>{})), expected);
}
{
// from pointer to local
int t = 42;
strict_not_null<int*> x{&t};
helper(&t);
helper_const(&t);
EXPECT_TRUE(*x == 42);
}
{
// from raw pointer
// from strict_not_null pointer
int t = 42;
int* p = &t;
strict_not_null<int*> x{p};
helper(p);
helper_const(p);
helper(x);
helper_const(x);
EXPECT_TRUE(*x == 42);
}
{
// from raw const pointer
// from strict_not_null const pointer
int t = 42;
const int* cp = &t;
strict_not_null<const int*> x{cp};
helper_const(cp);
helper_const(x);
EXPECT_TRUE(*x == 42);
}
{
// from strict_not_null const pointer, using auto
int t = 42;
const int* cp = &t;
auto x = strict_not_null<const int*>{cp};
EXPECT_TRUE(*x == 42);
}
{
// from returned pointer
EXPECT_DEATH(helper(return_pointer()), expected);
EXPECT_DEATH(helper_const(return_pointer()), expected);
}
}
template <typename U, typename = void>
static constexpr bool StrictHelperCompilesFor = false;
template <typename U>
static constexpr bool
StrictHelperCompilesFor<U, void_t<decltype(strict_helper(std::declval<U>()))>> = true;
template <typename U, typename = void>
static constexpr bool StrictHelperConstCompilesFor = false;
template <typename U>
static constexpr bool
StrictHelperConstCompilesFor<U, void_t<decltype(strict_helper_const(std::declval<U>()))>> =
true;
template <typename U, typename = void>
static constexpr bool HelperCompilesFor = false;
template <typename U>
static constexpr bool HelperCompilesFor<U, void_t<decltype(helper(std::declval<U>()))>> = true;
TEST(strict_notnull_tests, TestStrictNotNull)
{
{
// raw ptr <-> strict_not_null
int x = 42;
#ifdef CONFIRM_COMPILATION_ERRORS
strict_not_null<int*> snn = &x;
#endif
static_assert(!StrictHelperCompilesFor<int*>, "!StrictHelperCompilesFor<int*>");
static_assert(!StrictHelperConstCompilesFor<int*>,
"!StrictHelperCompilesFor<int*>");
const strict_not_null<int*> snn1{&x};
static_assert(StrictHelperCompilesFor<const strict_not_null<int*>>,
"StrictHelperCompilesFor<const strict_not_null<int*>>");
helper(snn1);
helper_const(snn1);
EXPECT_TRUE(*snn1 == 42);
}
{
// raw ptr <-> strict_not_null
const int x = 42;
#ifdef CONFIRM_COMPILATION_ERRORS
strict_not_null<int*> snn = &x;
#endif
static_assert(!StrictHelperCompilesFor<const int*>, "!StrictHelperFor<const int*>");
static_assert(!StrictHelperConstCompilesFor<const int*>,
"!StrictHelperCompilesFor<const int*>");
const strict_not_null<const int*> snn1{&x};
static_assert(!HelperCompilesFor<const strict_not_null<const int*>>,
"!HelperCompilesFor<const strict_not_null<const int*>>");
static_assert(StrictHelperConstCompilesFor<const strict_not_null<const int*>>,
"StrictHelperCompilesFor<const strict_not_null<const int*>>");
helper_const(snn1);
EXPECT_TRUE(*snn1 == 42);
}
{
// strict_not_null -> strict_not_null
int x = 42;
strict_not_null<int*> snn1{&x};
const strict_not_null<int*> snn2{&x};
strict_helper(snn1);
strict_helper_const(snn1);
strict_helper_const(snn2);
EXPECT_TRUE(snn1 == snn2);
}
{
// strict_not_null -> strict_not_null
const int x = 42;
strict_not_null<const int*> snn1{&x};
const strict_not_null<const int*> snn2{&x};
static_assert(!StrictHelperCompilesFor<strict_not_null<const int*>>,
"!StrictHelperCompilesFor<strict_not_null<const int*>>");
strict_helper_const(snn1);
strict_helper_const(snn2);
EXPECT_TRUE(snn1 == snn2);
}
{
// strict_not_null -> not_null
int x = 42;
strict_not_null<int*> snn{&x};
const not_null<int*> nn1 = snn;
const not_null<int*> nn2{snn};
helper(snn);
helper_const(snn);
EXPECT_TRUE(snn == nn1);
EXPECT_TRUE(snn == nn2);
}
{
// strict_not_null -> not_null
const int x = 42;
strict_not_null<const int*> snn{&x};
const not_null<const int*> nn1 = snn;
const not_null<const int*> nn2{snn};
static_assert(!HelperCompilesFor<strict_not_null<const int*>>,
"!HelperCompilesFor<strict_not_null<const int*>>");
helper_const(snn);
EXPECT_TRUE(snn == nn1);
EXPECT_TRUE(snn == nn2);
}
{
// not_null -> strict_not_null
int x = 42;
not_null<int*> nn{&x};
const strict_not_null<int*> snn1{nn};
const strict_not_null<int*> snn2{nn};
strict_helper(nn);
strict_helper_const(nn);
EXPECT_TRUE(snn1 == nn);
EXPECT_TRUE(snn2 == nn);
std::hash<strict_not_null<int*>> hash_snn;
std::hash<not_null<int*>> hash_nn;
EXPECT_TRUE(hash_nn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_snn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_nn(snn1) == hash_nn(snn2));
EXPECT_TRUE(hash_snn(snn1) == hash_snn(nn));
}
{
// not_null -> strict_not_null
const int x = 42;
not_null<const int*> nn{&x};
const strict_not_null<const int*> snn1{nn};
const strict_not_null<const int*> snn2{nn};
static_assert(!StrictHelperCompilesFor<not_null<const int*>>,
"!StrictHelperCompilesFor<not_null<const int*>>");
strict_helper_const(nn);
EXPECT_TRUE(snn1 == nn);
EXPECT_TRUE(snn2 == nn);
std::hash<strict_not_null<const int*>> hash_snn;
std::hash<not_null<const int*>> hash_nn;
EXPECT_TRUE(hash_nn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_snn(snn1) == hash_nn(nn));
EXPECT_TRUE(hash_nn(snn1) == hash_nn(snn2));
EXPECT_TRUE(hash_snn(snn1) == hash_snn(nn));
}
}
TEST(pointers_test, member_types)
{
// make sure `element_type` is inherited from `gsl::not_null`
static_assert(std::is_same<gsl::strict_not_null<int*>::element_type, int*>::value,
"check member type: element_type");
}
#if defined(__cplusplus) && (__cplusplus >= 201703L)
TEST(strict_notnull_tests, TestStrictNotNullConstructorTypeDeduction)
{
const auto terminateHandler = std::set_terminate([] {
std::cerr << "Expected Death. TestStrictNotNullConstructorTypeDeduction";
std::abort();
});
const auto expected = GetExpectedDeathString(terminateHandler);
{
int i = 42;
strict_not_null x{&i};
helper(strict_not_null{&i});
helper_const(strict_not_null{&i});
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
strict_not_null x{&i};
static_assert(!HelperCompilesFor<strict_not_null<const int*>>,
"!HelperCompilesFor<strict_not_null<const int*>>");
helper_const(strict_not_null{&i});
EXPECT_TRUE(*x == 42);
}
{
int i = 42;
int* p = &i;
strict_not_null x{p};
helper(strict_not_null{p});
helper_const(strict_not_null{p});
EXPECT_TRUE(*x == 42);
}
{
const int i = 42;
const int* p = &i;
strict_not_null x{p};
static_assert(!HelperCompilesFor<strict_not_null<const int*>>,
"!HelperCompilesFor<strict_not_null<const int*>>");
helper_const(strict_not_null{p});
EXPECT_TRUE(*x == 42);
}
{
auto workaround_macro = []() {
int* p1 = nullptr;
const strict_not_null x{p1};
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
auto workaround_macro = []() {
const int* p1 = nullptr;
const strict_not_null x{p1};
};
EXPECT_DEATH(workaround_macro(), expected);
}
{
int* p = nullptr;
EXPECT_DEATH(helper(strict_not_null{p}), expected);
EXPECT_DEATH(helper_const(strict_not_null{p}), expected);
}
#ifdef CONFIRM_COMPILATION_ERRORS
{
strict_not_null x{nullptr};
helper(strict_not_null{nullptr});
helper_const(strict_not_null{nullptr});
}
#endif
}
#endif // #if defined(__cplusplus) && (__cplusplus >= 201703L)