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forward declare basic_json, add two macros

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Those macros are used to reduce template argument boilerplate
This commit is contained in:
Théo DELRIEU 2017-07-01 19:44:05 +02:00
parent d3496347fc
commit fe086d7432
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1 changed files with 38 additions and 15 deletions
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53
src/json.hpp
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@ -115,6 +115,39 @@ SOFTWARE.
*/
namespace nlohmann
{
template<typename = void, typename = void>
struct adl_serializer;
// forward declaration of basic_json (required to split the class)
template <template <typename U, typename V, typename... Args> class ObjectType =
std::map,
template <typename U, typename... Args> class ArrayType = std::vector,
class StringType = std::string, class BooleanType = bool,
class NumberIntegerType = std::int64_t,
class NumberUnsignedType = std::uint64_t,
class NumberFloatType = double,
template <typename U> class AllocatorType = std::allocator,
template <typename T, typename SFINAE = void> class JSONSerializer =
adl_serializer>
class basic_json;
// Ugly macros to avoid uglier copy-paste when specializing basic_json
// This is only temporary and will be removed in 3.0
#define NLOHMANN_BASIC_JSON_TPL_DECLARATION \
template <template <typename, typename, typename...> class ObjectType, \
template <typename, typename...> class ArrayType, \
class StringType, class BooleanType, class NumberIntegerType, \
class NumberUnsignedType, class NumberFloatType, \
template <typename> class AllocatorType, \
template <typename, typename = void> class JSONSerializer>
#define NLOHMANN_BASIC_JSON_TPL \
basic_json<ObjectType, ArrayType, StringType, BooleanType, \
NumberIntegerType, NumberUnsignedType, NumberFloatType, \
AllocatorType, JSONSerializer>
/*!
@brief unnamed namespace with internal helper functions
@ -1251,7 +1284,7 @@ This serializer ignores the template arguments and uses ADL
([argument-dependent lookup](http://en.cppreference.com/w/cpp/language/adl))
for serialization.
*/
template<typename = void, typename = void>
template<typename, typename>
struct adl_serializer
{
/*!
@ -1369,25 +1402,13 @@ Format](http://rfc7159.net/rfc7159)
@nosubgrouping
*/
template <
template<typename U, typename V, typename... Args> class ObjectType = std::map,
template<typename U, typename... Args> class ArrayType = std::vector,
class StringType = std::string,
class BooleanType = bool,
class NumberIntegerType = std::int64_t,
class NumberUnsignedType = std::uint64_t,
class NumberFloatType = double,
template<typename U> class AllocatorType = std::allocator,
template<typename T, typename SFINAE = void> class JSONSerializer = adl_serializer
>
NLOHMANN_BASIC_JSON_TPL_DECLARATION
class basic_json
{
private:
template<detail::value_t> friend struct detail::external_constructor;
/// workaround type for MSVC
using basic_json_t = basic_json<ObjectType, ArrayType, StringType,
BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType,
AllocatorType, JSONSerializer>;
using basic_json_t = NLOHMANN_BASIC_JSON_TPL;
public:
using value_t = detail::value_t;
@ -14512,5 +14533,7 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
#undef JSON_LIKELY
#undef JSON_UNLIKELY
#undef JSON_DEPRECATED
#undef NLOHMANN_BASIC_JSON_TPL_DECLARATION
#undef NLOHMANN_BASIC_JSON_TPL
#endif