chore: supply a little helper for checking C++ boost-histogram

Author: henryiii

examples/cpp/CMakeLists.txt

@@ -0,0 +1,31 @@
+# This file lets you quickly build projects with the exact same boost-histogram
+# settings that the Python bindings use.
+
+cmake_minimum_required(VERSION 3.14...3.20)
+
+project(BOOST_HISTOGRAM_CPP LANGUAGES CXX)
+
+
+add_library(boost_histogram_cpp IMPORTED INTERFACE)
+
+# these are the boost header-only libraries required by boost::histogram
+target_include_directories(
+  boost_histogram_cpp
+  INTERFACE ../../extern/assert/include
+            ../../extern/config/include
+            ../../extern/core/include
+            ../../extern/histogram/include
+            ../../extern/mp11/include
+            ../../extern/throw_exception/include
+            ../../extern/variant2/include)
+
+
+target_compile_options(boost_histogram_cpp
+  INTERFACE $<IF:$<CXX_COMPILER_ID:MSVC>,/fp:fast,-funsafe-math-optimizations>)
+
+target_compile_features(boost_histogram_cpp INTERFACE cxx_std_14)
+
+if(PROJECT_NAME STREQUAL CMAKE_PROJECT_NAME)
+  add_executable(simple simple.cpp)
+  target_link_libraries(simple PRIVATE boost_histogram_cpp)
+endif()

examples/cpp/simple.cpp

@@ -0,0 +1,11 @@
+#include <boost/histogram.hpp>
+#include <iostream>
+
+int main() {
+  namespace bh = boost::histogram;
+
+  auto h = bh::make_histogram(bh::axis::category<int>{});
+
+  std::cout << bh::algorithm::sum(h) << std::endl;
+}
+