Comments (4)
That would only work on standard-layout types, no?
I think it is a good idea to provide it somehow, just clarifying the restrictions the standard imposes. Non-std::is_standard_layout
types would not have field offsets.
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Yes, you are right. offsetof
is only defined for standard layout types. I forgot about this restriction.
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Would that restriction prevent you from using it? It might be nice to know what the use-case is :)
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Wouldn't restrict me at all. My use-case is the same as in the reference from my initial post.
Given the definition of a vertex:
struct StandardVertex {
vec3 position;
vec3 normal;
vec4 tangent;
vec2 uv;
};
I'd like to generate the shader input description, required by the graphics API, using reflection. Currently I call offsetof
manually and store that value in an attribute:
REFL_TYPE(ikaros::StandardVertex)
REFL_FIELD(position, ikaros::attr::VertexFieldDescription(offsetof(ikaros::StandardVertex, position), "POSITION"));
REFL_FIELD(normal, ikaros::attr::VertexFieldDescription(offsetof(ikaros::StandardVertex, normal), "NORMAL"));
REFL_FIELD(tangent, ikaros::attr::VertexFieldDescription(offsetof(ikaros::StandardVertex, tangent), "TANGENT"));
REFL_FIELD(uv, ikaros::attr::VertexFieldDescription(offsetof(ikaros::StandardVertex, uv), "TEXCOORD", 0));
REFL_END
However, this feature is not critical at all. I am not 100% convinced yet myself whether this is the best approach. But I feel like having the field offset being part of the descriptor would be very helpful for this case, and probably a few others. The standard layout restriction isn't too problematic, one can practically always wrap a management class around a standard layout struct.
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Related Issues (20)
- GetDateFormat getter vs. the Win32 API HOT 2
- Use of `get_reader` and `has_writer` produces absurdly long compile times HOT 18
- Q: make REFL_AUTO, REFL_TYPE etc. callable from nested namespace HOT 7
- Port to vcpkg HOT 3
- Fix warnings for strict variadic macro checks (stronger C++20 enforcement)
- refl::util::detail::filter(..) inverts order of member list HOT 2
- Is there a way to reflect private fields? HOT 5
- Q: how to reflect on member functions' parameters and return types? HOT 5
- Is there a possibility of adding features like Boost.PFR? HOT 3
- Ability to break class declarations up HOT 9
- How to implement my case with this library? HOT 1
- Question. a generic getter function for reflected type HOT 1
- Enum reflection HOT 2
- Access member descriptor from pointer-to-member HOT 4
- Member list empty when using reflect<T>(), but works fine with reflect(const T&) HOT 1
- How to resolve the non-const signature of a class method. HOT 2
- Q: Implementing a member attribute for "Default value" to use in ctors
- (unknown)**ย that is all i get for typename HOT 1
- Deleted HOT 1
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