Build with:
mkdir build
cd build
cmake ..
make
Then run the python script.
Created
May 7, 2025 20:14
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Binding `static constexpr` in Python
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| #include <pybind11/pybind11.h> | |
| #include "constants.h" | |
| namespace py = pybind11; | |
| PYBIND11_MODULE(constexpr_demo, m) { | |
| // Bind the namespace-level constexpr | |
| m.attr("ERR_FAIL") = my_namespace::ERR_FAIL; | |
| } |
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| cmake_minimum_required(VERSION 3.14) | |
| project(constexpr_demo) | |
| # Enable C++17 | |
| set(CMAKE_CXX_STANDARD 17) | |
| set(CMAKE_CXX_STANDARD_REQUIRED ON) | |
| # Find pybind11 | |
| find_package(pybind11 REQUIRED) | |
| # Create the Python module | |
| pybind11_add_module(constexpr_demo bindings.cc) |
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| #pragma once | |
| namespace my_namespace { | |
| static constexpr int ERR_FAIL = 1; | |
| } |
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| import sys | |
| import os | |
| # Add the build directory relative to the script location | |
| this_dir = os.path.dirname(os.path.abspath(__file__)) | |
| build_dir = os.path.join(this_dir, "build") | |
| sys.path.insert(0, build_dir) | |
| import constexpr_demo | |
| print("Namespace constant:", constexpr_demo.ERR_FAIL) |
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