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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Which is capable of directly linking + invoking most C++ things (except constructors/destructors, it can't handle those, you need a function which calls the constructor from within C++) just given a type definition.
Then you have "d++", which lets you "#include" C/C++ headers. Under the hood tries to run an automatic syntax conversion. It can't handle but for simple code it works and can spit out the equivalent D.
https://github.com/atilaneves/dpp
Also you've got "dstep", which is "A tool for converting C and Objective-C headers to D modules"
https://github.com/jacob-carlborg/dstep
And finally you have the somewhat abandoned (but as far as I know mostly functional) Calypso, which is a fork of the LLVM-based D compiler that supports direct interop with C++. It's a pain to build though, haven't gotten around to trying to build it, but it does look wicked cool:
https://github.com/Syniurge/Calypso
pragma (cppmap, "cppheader.h"); // tells Clang to parse cppheader.h but do not import anything