diff options
author | James Ward <james.ward@arm.com> | 2020-09-25 11:43:21 +0100 |
---|---|---|
committer | James Ward <james.ward@arm.com> | 2020-09-30 08:41:31 +0000 |
commit | 22a4e1539aca7d39d7abc932f0a4d0b27beedf80 (patch) | |
tree | 95152943571413af5a3b550ac391bb17f258feef /third-party/mapbox/optional.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/optional.hpp')
-rw-r--r-- | third-party/mapbox/optional.hpp | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/third-party/mapbox/optional.hpp b/third-party/mapbox/optional.hpp new file mode 100644 index 0000000000..d84705c1ac --- /dev/null +++ b/third-party/mapbox/optional.hpp @@ -0,0 +1,74 @@ +#ifndef MAPBOX_UTIL_OPTIONAL_HPP +#define MAPBOX_UTIL_OPTIONAL_HPP + +#pragma message("This implementation of optional is deprecated. See https://github.com/mapbox/variant/issues/64.") + +#include <type_traits> +#include <utility> + +#include <mapbox/variant.hpp> + +namespace mapbox { +namespace util { + +template <typename T> +class optional +{ + static_assert(!std::is_reference<T>::value, "optional doesn't support references"); + + struct none_type + { + }; + + variant<none_type, T> variant_; + +public: + optional() = default; + + optional(optional const& rhs) + { + if (this != &rhs) + { // protect against invalid self-assignment + variant_ = rhs.variant_; + } + } + + optional(T const& v) { variant_ = v; } + + explicit operator bool() const noexcept { return variant_.template is<T>(); } + + T const& get() const { return variant_.template get<T>(); } + T& get() { return variant_.template get<T>(); } + + T const& operator*() const { return this->get(); } + T operator*() { return this->get(); } + + optional& operator=(T const& v) + { + variant_ = v; + return *this; + } + + optional& operator=(optional const& rhs) + { + if (this != &rhs) + { + variant_ = rhs.variant_; + } + return *this; + } + + template <typename... Args> + void emplace(Args&&... args) + { + variant_ = T{std::forward<Args>(args)...}; + } + + void reset() { variant_ = none_type{}; } + +}; // class optional + +} // namespace util +} // namespace mapbox + +#endif // MAPBOX_UTIL_OPTIONAL_HPP |