66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
#ifndef NLOHMANN_JSON_DETAIL_JSON_REF_HPP
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#define NLOHMANN_JSON_DETAIL_JSON_REF_HPP
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#include <initializer_list>
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#include <utility>
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namespace nlohmann
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{
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namespace detail
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{
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template<typename BasicJsonType>
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class json_ref
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{
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public:
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using value_type = BasicJsonType;
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json_ref(value_type&& value)
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: owned_value(std::move(value)), value_ref(&owned_value), is_rvalue(true)
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{}
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json_ref(const value_type& value)
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: value_ref(const_cast<value_type*>(&value)), is_rvalue(false)
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{}
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json_ref(std::initializer_list<json_ref> init)
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: owned_value(init), value_ref(&owned_value), is_rvalue(true)
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{}
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template<class... Args>
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json_ref(Args&& ... args)
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: owned_value(std::forward<Args>(args)...), value_ref(&owned_value), is_rvalue(true)
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{}
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// class should be movable only
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json_ref(json_ref&&) = default;
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json_ref(const json_ref&) = delete;
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json_ref& operator=(const json_ref&) = delete;
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value_type moved_or_copied() const
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{
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if (is_rvalue)
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{
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return std::move(*value_ref);
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}
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return *value_ref;
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}
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value_type const& operator*() const
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{
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return *static_cast<value_type const*>(value_ref);
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}
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value_type const* operator->() const
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{
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return static_cast<value_type const*>(value_ref);
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}
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private:
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mutable value_type owned_value = nullptr;
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value_type* value_ref = nullptr;
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const bool is_rvalue;
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};
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}
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}
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#endif
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