Confusing Angle Brackets < something > in c++

问题

I am coming from c to c++ and familiar with the syntax. But I just came across the code with syntax im not familiar with

int main() {
    std::shared_ptr < CommonAPI::Runtime > runtime = CommonAPI::Runtime::get();
    std::shared_ptr<HelloWorldProxy<>> myProxy =
        runtime->buildProxy<HelloWorldProxy>("local", "test");

Can Someone explain what does syntax something < something > something do also what does syntax something<something<>> something do.

回答1:

You're looking at C++ templates.

...allows a function or class to work on many different data types without being rewritten for each one.

来源：https://stackoverflow.com/questions/42962113/confusing-angle-brackets-something-in-c