Using std.format required std.string?

[anonymous via Digitalmars-d-learn]

On Sunday, 15 March 2015 at 18:03:55 UTC, Robert M. Münch wrote:
> On 2015-03-15 17:36:24 +0000, Robert M. Münch said:
>> Is there a way to use "version(...)" to have code sections 
>> depending on compiler version? Something like:
>> 
>> version(dmd >= 2.067) or version(dmd < 2.067)?
>
> Answerting myself:
>
> static if (__traits(compiles, version_minor < 67))
>  import std.string; // format() for versions < 2.0.67
> else
>  import std.format; // format() for versions >= 2.0.67

That doesn't do what you want.

You need to `import std.compiler;` for version_minor. Without 
that import, `__traits(compiles, version_minor < 67)` is always 
false, because version_minor is undefined.

And if you add the import, `__traits(compiles, version_minor < 
67)` is always true, no matter the value of version_minor. Use 
`static if(version_minor < 67)` instead.

Also, if you check version_minor, it's probably a good idea to 
check (or static assert) version_major, too.

Finally, there's need for this (yet). `std.string.format` is fine 
with 2.067, too. So unless you're going for (far) future 
compatiblity, you can just do `import std.string;`.