Initial commit of refactored multi_span originating from the Microsof…

…t GSL

.bazelrc

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+build --symlink_prefix=bazel-build/
+build --cxxopt='-std=c++14'
+

.gitignore

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+*.swp
+bazel-out
+bazel-build

BUILD

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+cc_library(
+    name = "multi_span",
+    hdrs = glob(["include/**/*"]),
+    include_prefix = "stdex",
+    strip_include_prefix = "include/stdex",
+    visibility = [
+        "//visibility:public",
+    ],
+)

WORKSPACE

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+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+# Keep aligned with tests/CMakeLists.txt
+http_archive(
+    name = "catch2",
+    build_file = "//third_party:BUILD.catch2",
+    sha256 = "5f31b93712e65d363f257ad0f0c02cfbed7a3988979d5f320ad7771e513d4cc8",
+    strip_prefix = "Catch2-2.0.1",
+    urls = ["https://github.com/catchorg/Catch2/archive/v2.0.1.tar.gz"],
+)

include/stdex/multi_span

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+///////////////////////////////////////////////////////////////////////////////
+//
+// Maintained by Jack Diver.
+//
+// Modified from :-
+//
+// github.com/microsoft/GSL
+//
+//
+// This code is licensed under the MIT License (MIT).
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#include "multi_span.hpp"