[bug#66870] [PATCH v6 02/11] gnu: Add function2.

[Sughosha via Guix-patches via <guix-patches@gnu.org>]

* gnu/packages/cpp.scm (function2): New variable.

Change-Id: Ida408b7746b3cb8828285b05fcc0abee4b1863ba
---
 gnu/packages/cpp.scm | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/gnu/packages/cpp.scm b/gnu/packages/cpp.scm
index 48fb323cd5..9f56779a40 100644
--- a/gnu/packages/cpp.scm
+++ b/gnu/packages/cpp.scm
@@ -2607,6 +2607,43 @@ (define-public bitsery
     (home-page "https://github.com/fraillt/bitsery")
     (license license:expat)))
 
+(define-public function2
+  (package
+    (name "function2")
+    (version "4.2.4")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/Naios/function2")
+                    (commit version)))
+              (file-name (git-file-name name version))
+              (sha256
+               (base32
+                "0l4kn81lfi687mv2d2mkrrqgjp9v186jlfshrgcr5717lwqw39xg"))
+              (modules '((guix build utils)))
+              (snippet
+               ;; Unbundle googletest.
+               '(begin
+                  (delete-file-recursively "test")
+                  (substitute* "CMakeLists.txt"
+                    (("add_subdirectory\\(test\\)") ""))))))
+    (build-system cmake-build-system)
+    ;; The test size_match_layout fails on i586/i686. For more info:
+    ;; https://github.com/Naios/function2/issues/57
+    (arguments
+     (list #:tests? #f))
+    (synopsis "Improved implementations of std::function")
+    (description "This package provides the following implementations of
+std::function:
+@itemize
+@item copyable fu2::function
+@item move-only fu2::unique_function (capable of holding move only types)
+@item non-owning fu2::function_view (capable of referencing callables in a non
+owning way)
+@end itemize")
+    (home-page "https://naios.github.io/function2/")
+    (license license:boost1.0)))
+
 (define-public cpp-mustache
   (package
     (name "cpp-mustache")
-- 
2.46.0