numpy 0.11.0

Rust binding of NumPy C-API
Documentation 
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//! Low-Level bindings for NumPy C API.
//!
//! https://numpy.org/doc/stable/reference/c-api
#![allow(non_camel_case_types, clippy::too_many_arguments)]

use pyo3::{ffi, Python};
use std::ffi::CString;
use std::os::raw::c_void;
use std::ptr::null_mut;

fn get_numpy_api(_py: Python, module: &str, capsule: &str) -> *const *const c_void {
    let module = CString::new(module).unwrap();
    let capsule = CString::new(capsule).unwrap();
    unsafe {
        let numpy = ffi::PyImport_ImportModule(module.as_ptr());
        assert!(!numpy.is_null(), "Failed to import numpy module");
        let capsule = ffi::PyObject_GetAttrString(numpy as _, capsule.as_ptr());
        assert!(!capsule.is_null(), "Failed to import numpy module");
        ffi::PyCapsule_GetPointer(capsule, null_mut()) as _
    }
}

// Define Array&UFunc APIs
macro_rules! impl_api {
    [$offset: expr; $fname: ident ( $($arg: ident : $t: ty),* ) $( -> $ret: ty )* ] => {
        #[allow(non_snake_case)]
        pub unsafe fn $fname(&self, $($arg : $t), *) $( -> $ret )* {
            let fptr = self.get($offset)
                           as *const extern fn ($($arg : $t), *) $( -> $ret )*;
            (*fptr)($($arg), *)
        }
    };
    // To allow fn a(b: type,) -> ret
    [$offset: expr; $fname: ident ( $($arg: ident : $t:ty,)* ) $( -> $ret: ty )* ] => {
        impl_api![$offset; $fname( $($arg: $t),*) $( -> $ret )*];
    }
}

pub mod array;
pub mod flags;
pub mod objects;
pub mod types;
pub mod ufunc;

pub use self::array::*;
pub use self::flags::*;
pub use self::objects::*;
pub use self::types::*;
pub use self::ufunc::*;