cppduals: add version 0.9.2 (#860)

use version 0.9.2

0.9.1 does not configure under a toolchain that sets CMAKE_CXX_STANDARD
as a normal variable; 0.9.2 fixes that.

Author: tesch1

cmake/configs/default.cmake

@@ -237,6 +237,7 @@ hunter_default_version(cpp-statsd-client VERSION 1.0.1-42f02b4-p0)
 hunter_default_version(cpp_redis VERSION 3.5.0-h1)
 hunter_default_version(cppast VERSION 0.0.0-b155d6a-p0)
 hunter_default_version(cppcodec VERSION 0.2-p0)
+hunter_default_version(cppduals VERSION 0.9.2)
 hunter_default_version(cppfs VERSION 1.3.0)
 hunter_default_version(cpr VERSION 1.3.0)
 hunter_default_version(cpuinfo VERSION 0.0.0-d5e37ad-p0)

cmake/projects/cppduals/hunter.cmake

@@ -0,0 +1,32 @@
+# Copyright (c) 2026, Michael Tesch
+# All rights reserved.
+
+# !!! DO NOT PLACE HEADER GUARDS HERE !!!
+
+include(hunter_add_version)
+include(hunter_cacheable)
+include(hunter_cmake_args)
+include(hunter_download)
+include(hunter_pick_scheme)
+
+hunter_add_version(
+    PACKAGE_NAME
+    cppduals
+    VERSION
+    0.9.2
+    URL
+    "https://gitlab.com/tesch1/cppduals/-/archive/v0.9.2/cppduals-v0.9.2.tar.gz"
+    SHA1
+    1478c1fe45269470182f0222056c27ab0e22dda8
+)
+
+hunter_cmake_args(
+    cppduals
+    CMAKE_ARGS
+        CPPDUALS_TESTING=OFF
+        CPPDUALS_BENCHMARK=OFF
+)
+
+hunter_pick_scheme(DEFAULT url_sha1_cmake)
+hunter_cacheable(cppduals)
+hunter_download(PACKAGE_NAME cppduals)

docs/packages/math.rst

@@ -10,6 +10,7 @@ Math
  - :ref:`pkg.GSL` - GNU Scientific Library
  - :ref:`pkg.HastyNoise` - SIMD open source noise generation library with a large collection of different noise algorithms.
  - :ref:`pkg.OpenBLAS` - OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version
+ - :ref:`pkg.cppduals` - header-only dual number library for exact forward-mode automatic differentiation.
  - :ref:`pkg.double-conversion` - provides binary-decimal and decimal-binary routines for IEEE doubles.
  - :ref:`pkg.gemmlowp` - Low-precision matrix multiplication.
  - :ref:`pkg.glm` - header only C++ mathematics library for graphics software based on the OpenGL Shading Language (GLSL) specifications.

docs/packages/pkg/cppduals.rst

@@ -0,0 +1,27 @@
+.. spelling:word-list::
+
+    cppduals
+    autodiff
+
+.. index:: math ; cppduals
+
+.. _pkg.cppduals:
+
+cppduals
+========
+
+-  https://gitlab.com/tesch1/cppduals
+-  `Documentation <https://tesch1.gitlab.io/cppduals/>`__
+-  Maintainer: https://github.com/tesch1
+
+Header-only dual number library for exact forward-mode automatic
+differentiation, with optional Eigen integration.
+
+If you use this in research, please cite
+`doi:10.21105/joss.01487 <https://doi.org/10.21105/joss.01487>`__
+(Tesch, JOSS 4(43):1487, 2019).
+
+.. literalinclude:: /../examples/cppduals/CMakeLists.txt
+  :language: cmake
+  :start-after: # DOCUMENTATION_START {
+  :end-before: # DOCUMENTATION_END }

examples/cppduals/CMakeLists.txt

@@ -0,0 +1,20 @@
+# Copyright (c) 2026, Michael Tesch
+# All rights reserved.
+
+cmake_minimum_required(VERSION 3.10)
+
+# Emulate HunterGate:
+# * https://github.com/hunter-packages/gate
+include("../common.cmake")
+
+project(download-cppduals)
+
+# DOCUMENTATION_START {
+hunter_add_package(cppduals)
+find_package(cppduals CONFIG REQUIRED)
+
+add_executable(foo foo.cpp)
+target_link_libraries(foo cppduals::duals)
+# DOCUMENTATION_END }
+
+set_target_properties(foo PROPERTIES CXX_STANDARD 17 CXX_STANDARD_REQUIRED YES)

examples/cppduals/foo.cpp

@@ -0,0 +1,8 @@
+#include <duals/dual> // duals::dual
+#include <iostream> // std::cout
+
+int main() {
+  using namespace duals::literals;
+  auto y = (2.0 + 1.0_e) * sin(2.0 + 1.0_e);
+  std::cout << "f(2) = " << rpart(y) << ", f'(2) = " << dpart(y) << std::endl;
+}