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Work around MSVC C++20 modules error for nested msgpack::object::with_zone

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When packaging msgpack into a C++20 module (by #include of msgpack in the
global module fragment and then `export using ...;` for relevant names),
MSVC (VS 17.13.5) reports the following:

```
error C2504: 'msgpack::v2::object': base class undefined
```

This is apparently due to with_zone being a nested type of msgpack::object;
in order to work around this problem, with_zone is replaced with an alias
to a struct defined outside of msgpack::object.
This commit is contained in:
Stephen Cross 2025-04-10 12:51:00 +01:00
parent 800c483b99
commit 712ec2e383
2 changed files with 7 additions and 4 deletions
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6
include/msgpack/v1/object.hpp
View File

@ -32,11 +32,11 @@ struct object_kv {
msgpack::object val; msgpack::object val;
}; };
struct object::with_zone : msgpack::object { struct object_with_zone_type : msgpack::object {
with_zone(msgpack::zone& z) : zone(z) { } object_with_zone_type(msgpack::zone& z) : zone(z) { }
msgpack::zone& zone; msgpack::zone& zone;
private: private:
with_zone(); object_with_zone_type();
}; };

5
include/msgpack/v1/object_fwd.hpp
View File

@ -68,6 +68,8 @@ public:
#endif // !defined(MSGPACK_USE_CPP03) #endif // !defined(MSGPACK_USE_CPP03)
struct object_with_zone_type;
/// Object class that corresponding to MessagePack format object /// Object class that corresponding to MessagePack format object
/** /**
* See https://github.com/msgpack/msgpack-c/wiki/v1_1_cpp_object * See https://github.com/msgpack/msgpack-c/wiki/v1_1_cpp_object
@ -219,7 +221,8 @@ struct object {
template <typename T> template <typename T>
object& operator=(const T& v); object& operator=(const T& v);
struct with_zone; // Not a nested struct (i.e. 'struct with_zone;') to work around MSVC C++20 modules error C2504
typedef object_with_zone_type with_zone;
protected: protected:
struct implicit_type; struct implicit_type;