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Added IndexOf

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This commit is contained in:
Stephen Seo 2016-02-25 12:27:04 +09:00
parent 8ffacb16b1
commit 4092c7c565
2 changed files with 45 additions and 7 deletions
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19
src/EC/Meta.hpp
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@ -33,6 +33,25 @@ namespace EC
template <typename T, typename TTypeList>
using Contains = std::integral_constant<bool, ContainsHelper<T, TTypeList>::value >;
template <typename T, typename... Types>
struct IndexOf
{
};
template <typename T, typename... Types>
struct IndexOf<T, TypeList<T, Types...> > :
std::integral_constant<std::size_t, 0>
{
};
template <typename T, typename Type, typename... Types>
struct IndexOf<T, TypeList<Type, Types...> > :
std::integral_constant<std::size_t, 1 +
IndexOf<T, TypeList<Types...> >::value
>
{
};
}
}

33
src/test/MetaTest.cpp
View file

@ -3,14 +3,16 @@
#include <EC/Meta.hpp>
struct C0 {};
struct C1 {};
struct C2 {};
struct C3 {};
using listAll = EC::Meta::TypeList<C0, C1, C2, C3>;
using listSome = EC::Meta::TypeList<C1, C3>;
TEST(Meta, Contains)
{
struct C0 {};
struct C1 {};
struct C2 {};
struct C3 {};
using listAll = EC::Meta::TypeList<C0, C1, C2, C3>;
int size = listAll::size;
EXPECT_EQ(size, 4);
@ -24,7 +26,6 @@ TEST(Meta, Contains)
result = EC::Meta::Contains<C3, listAll>::value;
EXPECT_TRUE(result);
using listSome = EC::Meta::TypeList<C1, C3>;
size = listSome::size;
EXPECT_EQ(size, 2);
@ -37,3 +38,21 @@ TEST(Meta, Contains)
result = EC::Meta::Contains<C3, listSome>::value;
EXPECT_TRUE(result);
}
TEST(Meta, IndexOf)
{
int index = EC::Meta::IndexOf<C0, listAll>::value;
EXPECT_EQ(index, 0);
index = EC::Meta::IndexOf<C1, listAll>::value;
EXPECT_EQ(index, 1);
index = EC::Meta::IndexOf<C2, listAll>::value;
EXPECT_EQ(index, 2);
index = EC::Meta::IndexOf<C3, listAll>::value;
EXPECT_EQ(index, 3);
index = EC::Meta::IndexOf<C1, listSome>::value;
EXPECT_EQ(index, 0);
index = EC::Meta::IndexOf<C3, listSome>::value;
EXPECT_EQ(index, 1);
}