Advanced Mac OS X Programming: The Big Nerd Ranch Guide

Arrays

D provides associative arrays that are similar to hashtables and dictionaries in other languages. The index into the array can be a n-tuple of values, separated by commas. arrayname[pid, probefunc, "bork"] = 23; is a valid assignment. The types of the array index must match for every assignment, and the assigned values must be uniform. You cannot nest arrays.

Example 9.9 calculates the wall-clock time it takes to execute the read() system call:

Example 9.9. readtime.d

s​y​s​c​a​l​l​:​:​r​e​a​d​:​e​n​t​r​y​ {​ ​ ​ ​ ​s​e​l​f​-​>​t​s​[​p​i​d​,​ ​p​r​o​b​e​f​u​n​c​]​ ​=​ ​t​i​m​e​s​t​a​m​p​;​ }​ s​y​s​c​a​l​l​:​:​r​e​a​d​:​r​e​t​u​r​n​ /​s​e​l​f​-​>​t​s​[​p​i​d​,​ ​p​r​o​b​e​f​u​n​c​]​ ​!​=​ ​0​/​ {​ ​ ​ ​ ​d​e​l​t​a​ ​=​ ​t​i​m​e​s​t​a​m​p​ ...