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Function cmpTimeUnits

Compares two time unit strings. "years" are the largest units and "hnsecs" are the smallest.

int cmpTimeUnits (
  string lhs,
  string rhs
) pure @safe;


this < rhs < 0
this == rhs 0
this > rhs > 0


DateTimeException if either of the given strings is not a valid time unit string.


import std.exception : assertThrown;

writeln(cmpTimeUnits("hours", "hours")); // 0
assert(cmpTimeUnits("hours", "weeks") < 0);
assert(cmpTimeUnits("months", "seconds") > 0);

assertThrown!DateTimeException(cmpTimeUnits("month", "second"));

Enum member CmpTimeUnits

Compares two time unit strings at compile time. "years" are the largest units and "hnsecs" are the smallest.

enum CmpTimeUnits(string lhs, string rhs) = cmpTimeUnitsCTFE(lhs, rhs);

This template is used instead of cmpTimeUnits because exceptions can't be thrown at compile time and cmpTimeUnits must enforce that the strings it's given are valid time unit strings. This template uses a template constraint instead.


this < rhs < 0
this == rhs 0
this > rhs > 0


static assert(CmpTimeUnits!("years", "weeks") > 0);
static assert(CmpTimeUnits!("days", "days") == 0);
static assert(CmpTimeUnits!("seconds", "hours") < 0);


Jonathan M Davis


Boost License 1.0.