gnu: Add tsl-sparse-map.

* gnu/packages/cpp.scm (tsl-sparse-map): New variable.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

gnu/packages/cpp.scm

@@ -2624,3 +2624,39 @@ (define-public tsl-hopscotch-map
 resolve collisions.  It is intended to be fast and provides additional
 features, such as heterogeneous lookups and different growth policies.")
     (license license:expat)))
+
+(define-public tsl-sparse-map
+  (package
+    (name "tsl-sparse-map")
+    (version "0.6.2")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/Tessil/sparse-map")
+                    (commit (string-append "v" version))))
+              (sha256
+               (base32
+                "0rb7w0hzsj4qbm0dff1niaf75aag9lj0xqhgb3vg5h9hfic62ic2"))
+              (file-name (git-file-name name version))))
+    (build-system cmake-build-system)
+    (arguments
+     (list
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'patch-cmake-test
+            (lambda _
+              (let ((file (open-file "CMakeLists.txt" "a")))
+                (display "\nenable_testing()\nadd_subdirectory(tests)" file)
+                (close-port file))
+              (substitute* "tests/CMakeLists.txt"
+                (("set\\(Boost_USE_STATIC_LIBS.*") "")
+                (("add_subdirectory\\(\\.\\..*")
+                 "add_test(tsl_sparse_map_tests tsl_sparse_map_tests)\n")))))))
+    (native-inputs (list boost))
+    (home-page "https://github.com/Tessil/sparse-map")
+    (synopsis "Sparse hash map")
+    (description "This package provides a C++ implementation of a hash map and
+a hash set with open addressing and sparse quadratic probing.  It is intended
+to be memory efficient and provides additional features, such as heterogeneous
+lookups and different growth policies.")
+    (license license:expat)))