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// -------------------------------------------------------------------------------------------------
// Copyright (C) 2015-2026 Nautech Systems Pty Ltd. All rights reserved.
// https://nautechsystems.io
//
// Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
// You may not use this file except in compliance with the License.
// You may obtain a copy of the License at https://www.gnu.org/licenses/lgpl-3.0.en.html
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// -------------------------------------------------------------------------------------------------
//! Order execution system for [NautilusTrader](https://nautilustrader.io).
//!
//! The `nautilus-execution` crate provides an order execution system that handles the complete
//! order lifecycle from submission to fill processing. This includes sophisticated order matching,
//! execution venue integration, and advanced order type emulation:
//!
//! - **Execution engine**: Central orchestration of order routing and position management.
//! - **Order matching engine**: High-fidelity market simulation for backtesting and paper trading.
//! - **Order emulator**: Advanced order types not natively supported by venues (trailing stops, contingent orders).
//! - **Execution clients**: Abstract interfaces for connecting to trading venues and brokers.
//! - **Order manager**: Local order lifecycle management and state tracking.
//! - **Matching core**: Low-level order book and price-time priority matching algorithms.
//! - **Fee and fill models**: Configurable execution cost simulation and realistic fill behavior.
//!
//! The crate supports both live trading environments (with real execution clients) and simulated
//! environments (with matching engines), making it suitable for production trading, strategy
//! development, and backtesting.
//!
//! # NautilusTrader
//!
//! [NautilusTrader](https://nautilustrader.io) is an open-source, production-grade, Rust-native
//! engine for multi-asset, multi-venue trading systems.
//!
//! The system spans research, deterministic simulation, and live execution within a single
//! event-driven architecture, providing research-to-live semantic parity.
//!
//! # Feature Flags
//!
//! This crate provides feature flags to control source code inclusion during compilation,
//! depending on the intended use case, i.e. whether to provide Python bindings
//! for the [nautilus_trader](https://pypi.org/project/nautilus_trader) Python package,
//! or as part of a Rust only build.
//!
//! - `ffi`: Enables the C foreign function interface (FFI) from [cbindgen](https://github.com/mozilla/cbindgen).
//! - `python`: Enables Python bindings from [PyO3](https://pyo3.rs).
//! - `extension-module`: Builds the crate as a Python extension module.