Go vs C++ interoperability has been discussed many times so far (here, for example), and generally it has been shown that it's possible to wrap C++ functions in C functions, and than to wrap C functions in CGO functions. This is the way how to use C++ code in Go application. However, the most of examples consider only functions with parameters of primitive data types (like int or char *).
But what if C++ function expects STL containers like std::vector or std::set to be passed? There are no equivalents for them in C, so I have no idea what to pass from C to C++.
static Status GetApproximateMemoryUsageByType(
const std::vector<DB*>& dbs,
const std::unordered_set<const Cache*> cache_set,
std::map<MemoryUtil::UsageType, uint64_t>* usage_by_type);
UPD
Just for the reference, here is the example of how this problem was solved. This is a real function from RocksDB C++ API. In order to use it in Go, it should be wrapped in function (or several functions) that are written in C++, but look like as just they're written in plain C. These wrappers are compiled to library with Go binary links against.
