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move primitive_iterator outside of basic_json

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Théo DELRIEU 2017-07-01 20:18:42 +02:00
parent 8e681d1e57
commit 00d6e27194
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GPG key ID: CDC9DE164D97A180
1 changed files with 148 additions and 138 deletions
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286
src/json.hpp
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@ -3569,6 +3569,152 @@ class parser
/// possible reason for the syntax error /// possible reason for the syntax error
token_type expected = token_type::uninitialized; token_type expected = token_type::uninitialized;
}; };
///////////////
// iterators //
///////////////
/*!
@brief an iterator for primitive JSON types
This class models an iterator for primitive JSON types (boolean, number,
string). It's only purpose is to allow the iterator/const_iterator classes
to "iterate" over primitive values. Internally, the iterator is modeled by
a `difference_type` variable. Value begin_value (`0`) models the begin,
end_value (`1`) models past the end.
*/
class primitive_iterator_t
{
public:
using difference_type = std::ptrdiff_t;
difference_type get_value() const noexcept
{
return m_it;
}
/// set iterator to a defined beginning
void set_begin() noexcept
{
m_it = begin_value;
}
/// set iterator to a defined past the end
void set_end() noexcept
{
m_it = end_value;
}
/// return whether the iterator can be dereferenced
constexpr bool is_begin() const noexcept
{
return (m_it == begin_value);
}
/// return whether the iterator is at end
constexpr bool is_end() const noexcept
{
return (m_it == end_value);
}
friend constexpr bool operator==(primitive_iterator_t lhs,
primitive_iterator_t rhs) noexcept
{
return lhs.m_it == rhs.m_it;
}
friend constexpr bool operator!=(primitive_iterator_t lhs,
primitive_iterator_t rhs) noexcept
{
return !(lhs == rhs);
}
friend constexpr bool operator<(primitive_iterator_t lhs,
primitive_iterator_t rhs) noexcept
{
return lhs.m_it < rhs.m_it;
}
friend constexpr bool operator<=(primitive_iterator_t lhs,
primitive_iterator_t rhs) noexcept
{
return lhs.m_it <= rhs.m_it;
}
friend constexpr bool operator>(primitive_iterator_t lhs,
primitive_iterator_t rhs) noexcept
{
return lhs.m_it > rhs.m_it;
}
friend constexpr bool operator>=(primitive_iterator_t lhs,
primitive_iterator_t rhs) noexcept
{
return lhs.m_it >= rhs.m_it;
}
primitive_iterator_t operator+(difference_type i)
{
auto result = *this;
result += i;
return result;
}
friend constexpr difference_type
operator-(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it - rhs.m_it;
}
friend std::ostream& operator<<(std::ostream& os, primitive_iterator_t it)
{
return os << it.m_it;
}
primitive_iterator_t& operator++()
{
++m_it;
return *this;
}
primitive_iterator_t operator++(int)
{
auto result = *this;
m_it++;
return result;
}
primitive_iterator_t& operator--()
{
--m_it;
return *this;
}
primitive_iterator_t operator--(int)
{
auto result = *this;
m_it--;
return result;
}
primitive_iterator_t& operator+=(difference_type n)
{
m_it += n;
return *this;
}
primitive_iterator_t& operator-=(difference_type n)
{
m_it -= n;
return *this;
}
private:
static constexpr difference_type begin_value = 0;
static constexpr difference_type end_value = begin_value + 1;
/// iterator as signed integer type
difference_type m_it = std::numeric_limits<std::ptrdiff_t>::denorm_min();
};
} // namespace detail } // namespace detail
/// namespace to hold default `to_json` / `from_json` functions /// namespace to hold default `to_json` / `from_json` functions
@ -4047,6 +4193,8 @@ class basic_json
using lexer = ::nlohmann::detail::lexer<basic_json>; using lexer = ::nlohmann::detail::lexer<basic_json>;
using parser = ::nlohmann::detail::parser<basic_json>; using parser = ::nlohmann::detail::parser<basic_json>;
using primitive_iterator_t = ::nlohmann::detail::primitive_iterator_t;
public: public:
using value_t = detail::value_t; using value_t = detail::value_t;
// forward declarations // forward declarations
@ -10405,144 +10553,6 @@ class basic_json
private: private:
///////////////
// iterators //
///////////////
/*!
@brief an iterator for primitive JSON types
This class models an iterator for primitive JSON types (boolean, number,
string). It's only purpose is to allow the iterator/const_iterator classes
to "iterate" over primitive values. Internally, the iterator is modeled by
a `difference_type` variable. Value begin_value (`0`) models the begin,
end_value (`1`) models past the end.
*/
class primitive_iterator_t
{
public:
difference_type get_value() const noexcept
{
return m_it;
}
/// set iterator to a defined beginning
void set_begin() noexcept
{
m_it = begin_value;
}
/// set iterator to a defined past the end
void set_end() noexcept
{
m_it = end_value;
}
/// return whether the iterator can be dereferenced
constexpr bool is_begin() const noexcept
{
return (m_it == begin_value);
}
/// return whether the iterator is at end
constexpr bool is_end() const noexcept
{
return (m_it == end_value);
}
friend constexpr bool operator==(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it == rhs.m_it;
}
friend constexpr bool operator!=(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return !(lhs == rhs);
}
friend constexpr bool operator<(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it < rhs.m_it;
}
friend constexpr bool operator<=(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it <= rhs.m_it;
}
friend constexpr bool operator>(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it > rhs.m_it;
}
friend constexpr bool operator>=(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it >= rhs.m_it;
}
primitive_iterator_t operator+(difference_type i)
{
auto result = *this;
result += i;
return result;
}
friend constexpr difference_type operator-(primitive_iterator_t lhs, primitive_iterator_t rhs) noexcept
{
return lhs.m_it - rhs.m_it;
}
friend std::ostream& operator<<(std::ostream& os, primitive_iterator_t it)
{
return os << it.m_it;
}
primitive_iterator_t& operator++()
{
++m_it;
return *this;
}
primitive_iterator_t operator++(int)
{
auto result = *this;
m_it++;
return result;
}
primitive_iterator_t& operator--()
{
--m_it;
return *this;
}
primitive_iterator_t operator--(int)
{
auto result = *this;
m_it--;
return result;
}
primitive_iterator_t& operator+=(difference_type n)
{
m_it += n;
return *this;
}
primitive_iterator_t& operator-=(difference_type n)
{
m_it -= n;
return *this;
}
private:
static constexpr difference_type begin_value = 0;
static constexpr difference_type end_value = begin_value + 1;
/// iterator as signed integer type
difference_type m_it = std::numeric_limits<std::ptrdiff_t>::denorm_min();
};
/*! /*!
@brief an iterator value @brief an iterator value