A header-only C++23 implementation of Parallel DEVS (PDEVS) simulation.

cdboost provides a lightweight, template-based PDEVS simulator. The core architecture follows the standard coordinator/simulator hierarchy:

• Atomic models inherit from cdboost::pdevs::atomic<TIME, MSG> and implement internal(), external(), confluence(), out(), and advance().
• Coupled models compose atomic and coupled submodels via external input couplings (EIC), internal couplings (IC), and external output couplings (EOC).
• Coordinators manage the simulation hierarchy; cdboost::pdevs::coordinator handles both atomic simulators and coupled coordinators.
• Runner drives simulation to a given end time or until passivation.

Built-in basic models: generator, processor, infinite_counter, event_stream, input_stream.

• C++23 compiler (GCC 13+, Clang 16+)
• CMake 3.28+
• vcpkg (for dependencies)
• boost-rational (no C++23 equivalent for exact rational arithmetic)
• Catch2 3.x (tests only)

cmake -B build -DCMAKE_TOOLCHAIN_FILE=$VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake
cmake --build build
ctest --test-dir build

#include <cdboost/pdevs/atomic.hpp>
#include <cdboost/pdevs/coupled.hpp>
#include <cdboost/pdevs/runner.hpp>
#include <cdboost/convenience.hpp>

// Define a TIME type that satisfies TIME::Inf() and arithmetic operators
// then define atomic models, compose into a coupled model, and run:

auto top = std::make_shared<cdboost::pdevs::coupled<Time, Msg>>(models, eic, ic, eoc);
cdboost::pdevs::runner<Time, Msg> r{top, Time{0}, std::cout, my_output_fn};
r.runUntilPassivate();

BSD 2-Clause. Copyright (c) 2013-present, Damian Vicino.