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Weird template issue in large project #1162
Description
So I've been integrating this amazing json library into a closed source project for some time, recently when I started using std::variant a bit, things started to go south on gcc 8.1.0. The same code compiles and works fine on visual studio 2017 (latest as of this writing).
The basic idea is I have a variant with various structures defined in it, each with their own overload for to_json/from_json calls.
When I try to use std::get<structure_name>(variant_member) I get an error:
error: exception specification of ‘nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>::basic_json(CompatibleType&&) [with CompatibleType = const signalwire::client::blade::Netcast::RouteRemove&; U = signalwire::client::blade::Netcast::RouteRemove; typename std::enable_if<nlohmann::detail::is_compatible_type<nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer>, U>::value, int>::type <anonymous> = 0; ObjectType = std::map; ArrayType = std::vector; StringType = std::__cxx11::basic_string<char>; BooleanType = bool; NumberIntegerType = long int; NumberUnsignedType = long unsigned int; NumberFloatType = double; AllocatorType = std::allocator; JSONSerializer = nlohmann::adl_serializer]’ depends on itself
Note other uses with std::variant have worked in the past on same compiler/platform.
Activity
JasonDictos commentedon Jul 14, 2018
Ah, figured it out. I was using an alias for my variant type, then I was specializing the to_json with that definition. By removing that specialization, all is well.