duckdb-extension-framework 0.1.3

Purely experimental DuckDB extension framework
Documentation 
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use crate::check;
use crate::duckly::{duckdb_connect, duckdb_connection, duckdb_database};
use crate::Connection;
use std::ffi::c_void;
use std::ptr::{addr_of, null_mut};

/// Equivalent of [`DatabaseData`](https://github.com/duckdb/duckdb/blob/50951241de3d9c06fac5719dcb907eb21163dcab/src/include/duckdb/main/capi_internal.hpp#L27), wraps `duckdb::DuckDB`
#[repr(C)]
#[derive(Debug)]
struct Wrapper {
    instance: *const c_void,
}

#[derive(Debug)]
pub struct Database(Wrapper);

impl Database {
    pub fn from_cpp_duckdb(ptr: *mut c_void) -> Self {
        Self(Wrapper { instance: ptr })
    }

    fn ptr(&self) -> duckdb_database {
        addr_of!(self.0) as duckdb_database
    }

    /// # Safety
    pub unsafe fn connect(&self) -> Result<Connection, Box<dyn std::error::Error>> {
        let mut connection: duckdb_connection = null_mut();
        check!(duckdb_connect(self.ptr(), &mut connection));
        Ok(Connection::from(connection))
    }
}