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167 lines
4.6 KiB
C++
167 lines
4.6 KiB
C++
#pragma once
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#include <cstdint> // uint8_t
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#include <tuple> // tie
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#include <utility> // move
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namespace nlohmann
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{
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/*!
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@brief an internal type for a backed binary type
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This type extends the template parameter @a BinaryType provided to `basic_json`
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with a subtype used by BSON and MessagePack. This type exists so that the user
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does not have to specify a type themselves with a specific naming scheme in
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order to override the binary type.
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@tparam BinaryType container to store bytes (`std::vector<std::uint8_t>` by
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default)
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@since version 3.8.0
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*/
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template<typename BinaryType>
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class byte_container_with_subtype : public BinaryType
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{
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public:
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/// the type of the underlying container
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using container_type = BinaryType;
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byte_container_with_subtype() noexcept(noexcept(container_type()))
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: container_type()
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{}
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byte_container_with_subtype(const container_type& b) noexcept(noexcept(container_type(b)))
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: container_type(b)
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{}
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byte_container_with_subtype(container_type&& b) noexcept(noexcept(container_type(std::move(b))))
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: container_type(std::move(b))
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{}
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byte_container_with_subtype(const container_type& b, std::uint8_t subtype_) noexcept(noexcept(container_type(b)))
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: container_type(b)
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, m_subtype(subtype_)
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, m_has_subtype(true)
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{}
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byte_container_with_subtype(container_type&& b, std::uint8_t subtype_) noexcept(noexcept(container_type(std::move(b))))
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: container_type(std::move(b))
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, m_subtype(subtype_)
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, m_has_subtype(true)
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{}
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bool operator==(const byte_container_with_subtype& rhs) const
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{
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return std::tie(static_cast<const BinaryType&>(*this), m_subtype, m_has_subtype) ==
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std::tie(static_cast<const BinaryType&>(rhs), rhs.m_subtype, rhs.m_has_subtype);
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}
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bool operator!=(const byte_container_with_subtype& rhs) const
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{
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return !(rhs == *this);
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}
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/*!
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@brief sets the binary subtype
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Sets the binary subtype of the value, also flags a binary JSON value as
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having a subtype, which has implications for serialization.
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@complexity Constant.
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@exceptionsafety No-throw guarantee: this member function never throws
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exceptions.
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@sa see @ref subtype() -- return the binary subtype
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@sa see @ref clear_subtype() -- clears the binary subtype
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@sa see @ref has_subtype() -- returns whether or not the binary value has a
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subtype
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@since version 3.8.0
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*/
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void set_subtype(std::uint8_t subtype_) noexcept
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{
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m_subtype = subtype_;
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m_has_subtype = true;
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}
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/*!
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@brief return the binary subtype
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Returns the numerical subtype of the value if it has a subtype. If it does
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not have a subtype, this function will return size_t(-1) as a sentinel
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value.
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@return the numerical subtype of the binary value
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@complexity Constant.
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@exceptionsafety No-throw guarantee: this member function never throws
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exceptions.
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@sa see @ref set_subtype() -- sets the binary subtype
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@sa see @ref clear_subtype() -- clears the binary subtype
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@sa see @ref has_subtype() -- returns whether or not the binary value has a
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subtype
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@since version 3.8.0
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*/
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constexpr std::uint8_t subtype() const noexcept
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{
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return m_subtype;
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}
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/*!
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@brief return whether the value has a subtype
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@return whether the value has a subtype
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@complexity Constant.
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@exceptionsafety No-throw guarantee: this member function never throws
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exceptions.
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@sa see @ref subtype() -- return the binary subtype
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@sa see @ref set_subtype() -- sets the binary subtype
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@sa see @ref clear_subtype() -- clears the binary subtype
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@since version 3.8.0
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*/
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constexpr bool has_subtype() const noexcept
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{
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return m_has_subtype;
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}
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/*!
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@brief clears the binary subtype
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Clears the binary subtype and flags the value as not having a subtype, which
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has implications for serialization; for instance MessagePack will prefer the
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bin family over the ext family.
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@complexity Constant.
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@exceptionsafety No-throw guarantee: this member function never throws
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exceptions.
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@sa see @ref subtype() -- return the binary subtype
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@sa see @ref set_subtype() -- sets the binary subtype
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@sa see @ref has_subtype() -- returns whether or not the binary value has a
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subtype
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@since version 3.8.0
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*/
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void clear_subtype() noexcept
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{
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m_subtype = 0;
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m_has_subtype = false;
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}
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private:
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std::uint8_t m_subtype = 0;
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bool m_has_subtype = false;
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};
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} // namespace nlohmann
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