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add detail/json_ref.hpp

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Théo DELRIEU 2017-08-14 18:14:27 +02:00
parent a3473fda6a
commit 8e9714fe3d
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GPG Key ID: 51AC4B3A2C47C10F
3 changed files with 69 additions and 58 deletions
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3
Makefile
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@ -21,7 +21,8 @@ SRCS = ${SRCDIR}/json.hpp \
${SRCDIR}/detail/parsing/output_adapters.hpp \ ${SRCDIR}/detail/parsing/output_adapters.hpp \
${SRCDIR}/detail/parsing/binary_reader.hpp \ ${SRCDIR}/detail/parsing/binary_reader.hpp \
${SRCDIR}/detail/parsing/binary_writer.hpp \ ${SRCDIR}/detail/parsing/binary_writer.hpp \
${SRCDIR}/detail/serializer.hpp ${SRCDIR}/detail/serializer.hpp \
${SRCDIR}/detail/json_ref.hpp
# main target # main target
all: all:

66
src/detail/json_ref.hpp Normal file
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@ -0,0 +1,66 @@
#ifndef NLOHMANN_JSON_DETAIL_JSON_REF_HPP
#define NLOHMANN_JSON_DETAIL_JSON_REF_HPP
#include <initializer_list>
#include <utility>
namespace nlohmann
{
namespace detail
{
template<typename BasicJsonType>
class json_ref
{
public:
using value_type = BasicJsonType;
json_ref(value_type&& value)
: owned_value(std::move(value)), value_ref(&owned_value), is_rvalue(true)
{}
json_ref(const value_type& value)
: value_ref(const_cast<value_type*>(&value)), is_rvalue(false)
{}
json_ref(std::initializer_list<json_ref> init)
: owned_value(init), value_ref(&owned_value), is_rvalue(true)
{}
template<class... Args>
json_ref(Args&& ... args)
: owned_value(std::forward<Args>(args)...), value_ref(&owned_value), is_rvalue(true)
{}
// class should be movable only
json_ref(json_ref&&) = default;
json_ref(const json_ref&) = delete;
json_ref& operator=(const json_ref&) = delete;
value_type moved_or_copied() const
{
if (is_rvalue)
{
return std::move(*value_ref);
}
return *value_ref;
}
value_type const& operator*() const
{
return *static_cast<value_type const*>(value_ref);
}
value_type const* operator->() const
{
return static_cast<value_type const*>(value_ref);
}
private:
mutable value_type owned_value = nullptr;
value_type* value_ref = nullptr;
const bool is_rvalue;
};
}
}
#endif

58
src/json.hpp
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@ -69,6 +69,7 @@ SOFTWARE.
#include "detail/parsing/binary_reader.hpp" #include "detail/parsing/binary_reader.hpp"
#include "detail/parsing/binary_writer.hpp" #include "detail/parsing/binary_writer.hpp"
#include "detail/serializer.hpp" #include "detail/serializer.hpp"
#include "detail/json_ref.hpp"
/*! /*!
@brief namespace for Niels Lohmann @brief namespace for Niels Lohmann
@ -77,63 +78,6 @@ SOFTWARE.
*/ */
namespace nlohmann namespace nlohmann
{ {
namespace detail
{
template<typename BasicJsonType>
class json_ref
{
public:
using value_type = BasicJsonType;
json_ref(value_type&& value)
: owned_value(std::move(value)), value_ref(&owned_value), is_rvalue(true)
{}
json_ref(const value_type& value)
: value_ref(const_cast<value_type*>(&value)), is_rvalue(false)
{}
json_ref(std::initializer_list<json_ref> init)
: owned_value(init), value_ref(&owned_value), is_rvalue(true)
{}
template<class... Args>
json_ref(Args&& ... args)
: owned_value(std::forward<Args>(args)...), value_ref(&owned_value), is_rvalue(true)
{}
// class should be movable only
json_ref(json_ref&&) = default;
json_ref(const json_ref&) = delete;
json_ref& operator=(const json_ref&) = delete;
value_type moved_or_copied() const
{
if (is_rvalue)
{
return std::move(*value_ref);
}
return *value_ref;
}
value_type const& operator*() const
{
return *static_cast<value_type const*>(value_ref);
}
value_type const* operator->() const
{
return static_cast<value_type const*>(value_ref);
}
private:
mutable value_type owned_value = nullptr;
value_type* value_ref = nullptr;
const bool is_rvalue;
};
} // namespace detail
template<typename, typename> template<typename, typename>
struct adl_serializer struct adl_serializer
{ {