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author | James Ward <james.ward@arm.com> | 2020-09-25 11:43:21 +0100 |
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committer | James Ward <james.ward@arm.com> | 2020-09-30 08:41:31 +0000 |
commit | 22a4e1539aca7d39d7abc932f0a4d0b27beedf80 (patch) | |
tree | 95152943571413af5a3b550ac391bb17f258feef /third-party/mapbox/variant_cast.hpp | |
parent | ba3ef18cb6117c49fcdbf177dce5991d6d679cbc (diff) | |
download | armnn-22a4e1539aca7d39d7abc932f0a4d0b27beedf80.tar.gz |
IVGCVSW-4519 Remove Boost Variant and apply_visitor variant
* add mapbox/variant third party package
Signed-off-by: James Ward <james.ward@arm.com>
Change-Id: I181302780edd9dace40f158a11327316a12ce69a
Diffstat (limited to 'third-party/mapbox/variant_cast.hpp')
-rw-r--r-- | third-party/mapbox/variant_cast.hpp | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/third-party/mapbox/variant_cast.hpp b/third-party/mapbox/variant_cast.hpp new file mode 100644 index 0000000000..fe1ab35432 --- /dev/null +++ b/third-party/mapbox/variant_cast.hpp @@ -0,0 +1,85 @@ +#ifndef VARIANT_CAST_HPP +#define VARIANT_CAST_HPP + +#include <type_traits> + +namespace mapbox { +namespace util { + +namespace detail { + +template <class T> +class static_caster +{ +public: + template <class V> + T& operator()(V& v) const + { + return static_cast<T&>(v); + } +}; + +template <class T> +class dynamic_caster +{ +public: + using result_type = T&; + template <class V> + T& operator()(V& v, typename std::enable_if<!std::is_polymorphic<V>::value>::type* = nullptr) const + { + throw std::bad_cast(); + } + template <class V> + T& operator()(V& v, typename std::enable_if<std::is_polymorphic<V>::value>::type* = nullptr) const + { + return dynamic_cast<T&>(v); + } +}; + +template <class T> +class dynamic_caster<T*> +{ +public: + using result_type = T*; + template <class V> + T* operator()(V& v, typename std::enable_if<!std::is_polymorphic<V>::value>::type* = nullptr) const + { + return nullptr; + } + template <class V> + T* operator()(V& v, typename std::enable_if<std::is_polymorphic<V>::value>::type* = nullptr) const + { + return dynamic_cast<T*>(&v); + } +}; +} + +template <class T, class V> +typename detail::dynamic_caster<T>::result_type +dynamic_variant_cast(V& v) +{ + return mapbox::util::apply_visitor(detail::dynamic_caster<T>(), v); +} + +template <class T, class V> +typename detail::dynamic_caster<const T>::result_type +dynamic_variant_cast(const V& v) +{ + return mapbox::util::apply_visitor(detail::dynamic_caster<const T>(), v); +} + +template <class T, class V> +T& static_variant_cast(V& v) +{ + return mapbox::util::apply_visitor(detail::static_caster<T>(), v); +} + +template <class T, class V> +const T& static_variant_cast(const V& v) +{ + return mapbox::util::apply_visitor(detail::static_caster<const T>(), v); +} +} +} + +#endif // VARIANT_CAST_HPP |