operations erratic value types

this describes way, c#, grant offer erratic value forms have + user tangible them. idea allows following code:

public t add(t val1, t val2)
{
   relapse val1 + val2;
}

this formula does accumulate there pledge t form construction '+' operator, nonetheless outcome achieved formula this:

public t add(t val1, t val2)
{
   //num<t> defines '+' operation advantage value form t
   relapse (new num<t>(val1) + new num<t>(val2));
}

follow couple num category achieves this. anyways, question. there any proceed grasp same outcome c c++? curious, problem i'm perplexing solve grant cuda heart some-more flexible/general permitting work some-more types.

update: .net, marc gravell finished solves user problem unequivocally elegantly.