emptycrate.com/idocpp 1Copyright Jason Turner @le�icus emptycrate.com/idocpp Secrets of Scripting Bindings for C++ 2 . 1Copyright Jason Turner @le�icus emptycrate.com/idocpp Jason Turner C++ Weekly b1b7f77836 25 . 8Copyright Jason Turner @le�icus emptycrate.com/idocpp Secrets of Scripting Bindings for C++ 26 . 1Copyright Jason Turner @le�icus emptycrate.com/idocpp Jason Turner C++ Weekly

// error } }● Easy enough to return standard types (int, float, ...) ○ Let bindings library do the heavy lifting ● Can return python objects ○ boost::python::dict / boost::python::list Chose to write all code in Cython instead of C / C++ ● Benefits: ○ Easy interop, Cython writes the bindings for your helper functions ○ Easy syntax, code looks very similar to python ○ Can import C / C++

Python, Java) Reflection in C++ as per P2996 Syntax and examples Reflection libraries! Python bindings ABI hashing (boost::abi_hash?) A duck-typed std::any (boost::virtual_any?) Alternatives ways 42Now let's do some actual library design Automatic python bindings Automatic type ABI hash A better std::any with duck typing 43Python bindings 44We have a C++ class that we’d like to expose to Python “expose” C++ objects in python A fan favorite, and one of the most common wishlist items 45Python bindings struct Item { int id; PyObject* getPyValue() const; }; struct Row { const auto& items()

Can’t we just synthesize std::tuple_element from get? Jonathan Müller — @foonathanAdding structured bindings support to a custom tuple-like type template struct my_tuple { … }; Jonathan @foonathan Can’t we just synthesize std::tuple_element from get? CppCon 2024-09-18 1Adding structured bindings support to a custom tuple-like type template struct my_tuple { … }; template @foonathan Can’t we just synthesize std::tuple_element from get? CppCon 2024-09-18 1Adding structured bindings support to a custom tuple-like type template struct my_tuple { … }; template

version of C API spec. is 1.3 (2.0 arriving imminently!) - C offers great portability (Python, bindings, etc.), but has some disadvantages... GraphBLAS C API[DISTRIBUTION STATEMENT A] This material has version of C API spec. is 1.3 (2.0 arriving imminently!) - C offers great portability (Python, bindings, etc.), but has some disadvantages... GraphBLAS C API[DISTRIBUTION STATEMENT A] This material has version of C API spec. is 1.3 (2.0 arriving imminently!) - C offers great portability (Python, bindings, etc.), but has some disadvantages... GraphBLAS C API[DISTRIBUTION STATEMENT A] This material has

new ranges, language features 4Outline of the talk I Language & Library debugging structured bindings Language Templates Misc Contracts Reflection 5Outline of the talk II Library: string processing control of a debugger P2546 Debugging Support P2810 is_debugger_present is_replaceable 13Structured Bindings 14use as conditions in if, while, for, and switch statements success evaluation prior to destructuring namingIsHard(mutex); std::lock_guard _(mutex); 3 4 16.1P0609 Attributes for Structured Bindings auto g() { [[maybe_unused]] auto h = f(); auto [a, b [[maybe_unused]], c] = f(); return

standard bindings to C and Fortran, so we start with a plain ‘C-style’ imple- mentation based on simple loops and linear vectors for floating point data storage. (2) OpenMP also has bindings to C++, where

NRVO! 66Example 10 (continued) With NRVO! 67Example 11 - structured bindings NRVO! ? 68Example 11 - structured bindings With Instead, you could make two separate functions return a and b

] (auto var1, int var2) { return var1 + var2; } 42Lambda Expressions ● Structured Bindings ○ structured bindings make it easier to access elements of tuples, arrays, and other compound types auto [x

C++20 Concepts C++14 Function Deduced Return Type C++14 Generic Lambdas C++17 Structured Bindings C++17 CTADauto solution2(auto v) { using namespace std::ranges; nth_element(v, std::begin(v) + } C++20/23/xx Ranges C++23 Pipeline Operator C++14 Generic Lambdas C++17 Structured Bindings• SICP is an absolutely brilliant & timeless textbook • You will learn about the fundamentals of