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libcamera: span: Provide and use helper variable templates for type traits

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Following the C++17 practice, provide is_array_v<T> and is_span_v<T>
helper variable templates as shorter versions of is_array<T>::value and
is_span<T>::value, and use them through the code.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Laurent Pinchart
2020-10-28 03:33:06 +02:00
parent 6cbdc28599
commit 8e42c2feb7
2 changed files with 20 additions and 14 deletions
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include/libcamera/span.h
+14 -8
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@@ -31,6 +31,9 @@ template<typename U, std::size_t N>
struct is_array<std::array<U, N>> : public std::true_type {
};
template<typename T>
inline constexpr bool is_array_v = is_array<T>::value;
template<typename U>
struct is_span : public std::false_type {
};
@@ -39,6 +42,9 @@ template<typename U, std::size_t Extent>
struct is_span<Span<U, Extent>> : public std::true_type {
};
template<typename T>
inline constexpr bool is_span_v = is_span<T>::value;
} /* namespace details */
namespace utils {
@@ -155,8 +161,8 @@ public:
template<class Container>
explicit constexpr Span(Container &cont,
std::enable_if_t<!details::is_span<Container>::value &&
!details::is_array<Container>::value &&
std::enable_if_t<!details::is_span_v<Container> &&
!details::is_array_v<Container> &&
!std::is_array_v<Container> &&
std::is_convertible_v<std::remove_pointer_t<decltype(utils::data(cont))> (*)[],
element_type (*)[]>,
@@ -167,8 +173,8 @@ public:
template<class Container>
explicit constexpr Span(const Container &cont,
std::enable_if_t<!details::is_span<Container>::value &&
!details::is_array<Container>::value &&
std::enable_if_t<!details::is_span_v<Container> &&
!details::is_array_v<Container> &&
!std::is_array_v<Container> &&
std::is_convertible_v<std::remove_pointer_t<decltype(utils::data(cont))> (*)[],
element_type (*)[]>,
@@ -317,8 +323,8 @@ public:
template<class Container>
constexpr Span(Container &cont,
std::enable_if_t<!details::is_span<Container>::value &&
!details::is_array<Container>::value &&
std::enable_if_t<!details::is_span_v<Container> &&
!details::is_array_v<Container> &&
!std::is_array_v<Container> &&
std::is_convertible_v<std::remove_pointer_t<decltype(utils::data(cont))> (*)[],
element_type (*)[]>,
@@ -329,8 +335,8 @@ public:
template<class Container>
constexpr Span(const Container &cont,
std::enable_if_t<!details::is_span<Container>::value &&
!details::is_array<Container>::value &&
std::enable_if_t<!details::is_span_v<Container> &&
!details::is_array_v<Container> &&
!std::is_array_v<Container> &&
std::is_convertible_v<std::remove_pointer_t<decltype(utils::data(cont))> (*)[],
element_type (*)[]>,