CODEWITHSUNDEEP
d
John Zane
John Zane

Reputation: 888

Get current line of source file in D

Is there a way to get the current line in the source file you are on, like __LINE__ does in C++?

Upvotes: 5

Views: 231

Answers (1)

Justin W
Justin W

Reputation: 2077

Yep, you can use __LINE__. Also, __FILE__.

See Keywords section

As BCS and Jonathan M Davis point out in the comments, there is a special case for __LINE__ and friends: when used as the default value of a template or function argument, they resolve to the location of the caller, not the signature of the template or function. This is great for saving callers from having to provide this information.

void myAssert(T)(lazy T expression, string file = __FILE__, int line = __LINE__)
{
     if (!expression)
     {
          // Write the caller location
          writefln("Assert failure at %s:%s", file, line);
     }
}

Upvotes: 9

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