Timing code

timer.d

enum timingSetup = q{
    import std.datetime.stopwatch : AutoStart, StopWatch;
    import std.stdio : writeln;
    import std.conv : to;
    auto sw = StopWatch(AutoStart.yes);
    size_t lastLine = __LINE__;
};

template timingCheckpoint(size_t l)
{
    import std.conv : to;
    enum timingCheckpoint = `{
            immutable ll = lastLine;
            lastLine = ` ~ to!string(l) ~ `;
            sw.stop();
            writeln("Lines ", ll, " - ", lastLine , ": ", sw.peek());
            sw.reset();
            sw.start();
        }`;
}

mixin(timingSetup);
mixin(timingCheckpoint!__LINE__);