Increase parameter limit for trait beyond 7 argumentsIntoPyNativeFn #6098
Description
Summary
The current IntoPyNativeFn trait implementation has a hard limit of 7 parameters (excluding &VirtualMachine), which prevents defining Python methods with more arguments using the #[pymethod] attribute.
Problem
When trying to define a Python method with more than 7 parameters, the compiler fails with:
error[E0277]: the trait bound is not satisfiedfn(..., ..., i32, f32, i32, i32, i32, i32, i32, i32, i32, ...) -> ... {...::orb}: IntoPyNativeFn<...>
Example
This function fails to compile due to having 11 parameters:
#[pymethod]
fn orb(
query_path: String,
source_path: String,
nfeatures: i32,
scale_factor: f32,
nlevels: i32,
edge_threshold: i32,
first_level: i32,
wta_k: i32,
score_type: i32,
patch_size: i32,
fast_threshold: i32,
vm: &VirtualMachine,
) -> PyResult<PyObjectRef> { ... }
While this function with 7 parameters compiles successfully:
#[pymethod]
fn sift(
query_path: String,
source_path: String,
nfeatures: i32,
n_octave_layers: i32,
contrast_threshold: f64,
edge_threshold: f64,
sigma: f64,
vm: &VirtualMachine
) -> PyResult<PyObjectRef> { ... }
Extend the macro to support more parameter combinations, perhaps up to 15-20 parameters.