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make TypeListIndexer constexpr (#733)

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This commit is contained in:
Ian Taylor 2019-06-06 17:16:08 -04:00 committed by Anna Gringauze
parent b74b286d5e
commit 66809c6852
1 changed files with 5 additions and 5 deletions
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10
include/gsl/multi_span
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@ -518,31 +518,31 @@ namespace details
struct TypeListIndexer
{
const TypeChain& obj_;
TypeListIndexer(const TypeChain& obj) : obj_(obj) {}
constexpr TypeListIndexer(const TypeChain& obj) : obj_(obj) {}
template <std::size_t N>
const TypeChain& getObj(std::true_type)
constexpr const TypeChain& getObj(std::true_type)
{
return obj_;
}
template <std::size_t N, typename MyChain = TypeChain,
typename MyBase = typename MyChain::Base>
auto getObj(std::false_type)
constexpr auto getObj(std::false_type)
-> decltype(TypeListIndexer<MyBase>(static_cast<const MyBase&>(obj_)).template get<N>())
{
return TypeListIndexer<MyBase>(static_cast<const MyBase&>(obj_)).template get<N>();
}
template <std::size_t N>
auto get() -> decltype(getObj<N - 1>(std::integral_constant<bool, N == 0>()))
constexpr auto get() -> decltype(getObj<N - 1>(std::integral_constant<bool, N == 0>()))
{
return getObj<N - 1>(std::integral_constant<bool, N == 0>());
}
};
template <typename TypeChain>
TypeListIndexer<TypeChain> createTypeListIndexer(const TypeChain& obj)
constexpr TypeListIndexer<TypeChain> createTypeListIndexer(const TypeChain& obj)
{
return TypeListIndexer<TypeChain>(obj);
}