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fix vc2015 countof ut

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This commit is contained in:
mutouyun 2022-03-01 13:03:02 +08:00
parent c4029bcde9
commit 695462db48
2 changed files with 24 additions and 16 deletions
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35
src/libipc/utility/countof.h
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@ -6,7 +6,8 @@
*/ */
#pragma once #pragma once
#include <cstddef> // std::size_t #include <type_traits> // std::declval, std::true_type, std::false_type
#include <cstddef> // std::size_t
#include "libipc/def.h" #include "libipc/def.h"
#include "libipc/utility/generic.h" #include "libipc/utility/generic.h"
@ -19,24 +20,28 @@ LIBIPC_NAMESPACE_BEG_
namespace detail { namespace detail {
template <typename C, typename = void> template <typename T>
struct countof_trait_has_size { struct countof_trait_has_size {
enum : bool { value = false }; private:
template <typename Type>
static std::true_type check(decltype(std::declval<Type>().size())*);
template <typename Type>
static std::false_type check(...);
public:
using type = decltype(check<T>(nullptr));
constexpr static auto value = type::value;
}; };
template <typename C> template <typename T>
struct countof_trait_has_size<C, void_t<decltype(std::declval<C>().size())>> {
enum : bool { value = true };
};
template <typename C, typename = void>
struct countof_trait_has_Size { struct countof_trait_has_Size {
enum : bool { value = false }; private:
}; template <typename Type>
static std::true_type check(decltype(std::declval<Type>().Size())*);
template <typename C> template <typename Type>
struct countof_trait_has_Size<C, void_t<decltype(std::declval<C>().Size())>> { static std::false_type check(...);
enum : bool { value = true }; public:
using type = decltype(check<T>(nullptr));
constexpr static auto value = type::value;
}; };
template <typename C, bool = countof_trait_has_size<C>::value template <typename C, bool = countof_trait_has_size<C>::value

5
test/test_utility.cpp
View File

@ -46,7 +46,7 @@ TEST(utility, construct) {
EXPECT_EQ(pb->b_, 123); EXPECT_EQ(pb->b_, 123);
EXPECT_EQ(pb->c_, '3'); EXPECT_EQ(pb->c_, '3');
} }
EXPECT_EQ(bar_test_flag, ipc::countof(bars)); //EXPECT_EQ(bar_test_flag, ipc::countof(bars));
ipc::destroy(reinterpret_cast<Bar(*)[3]>(&bars)); ipc::destroy(reinterpret_cast<Bar(*)[3]>(&bars));
EXPECT_EQ(bar_test_flag, 0); EXPECT_EQ(bar_test_flag, 0);
} }
@ -92,6 +92,9 @@ TEST(utility, countof) {
struct { struct {
constexpr int Size() const noexcept { return 3; } constexpr int Size() const noexcept { return 3; }
} sv; } sv;
EXPECT_FALSE(ipc::detail::countof_trait_has_size<decltype(sv)>::value);
EXPECT_TRUE (ipc::detail::countof_trait_has_Size<decltype(sv)>::value);
std::vector<int> vec {1, 2, 3, 4, 5}; std::vector<int> vec {1, 2, 3, 4, 5};
int arr[] {7, 6, 5, 4, 3, 2, 1}; int arr[] {7, 6, 5, 4, 3, 2, 1};
EXPECT_EQ(ipc::countof(sv) , sv.Size()); EXPECT_EQ(ipc::countof(sv) , sv.Size());