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Function std.path.defaultExtension

immutable(Unqual!C1)[] defaultExtension(C1, C2) (
  in C1[] path,
  in C2[] ext
if (isSomeChar!C1 && is(Unqual!C1 == Unqual!C2));


path A path name.
ext The default extension to use.


The path given by path, with the extension given by ext appended if the path doesn't already have one.

Including the dot in the extension is optional.

This function always allocates a new string, except in the case when path is immutable and already has an extension.


writeln(defaultExtension("file", "ext")); // "file.ext"
writeln(defaultExtension("file", ".ext")); // "file.ext"
writeln(defaultExtension("file.", "ext")); // "file."
writeln(defaultExtension("file.old", "new")); // "file.old"
writeln(defaultExtension("file.old", ".new")); // "file.old"


Lars Tandle Kyllingstad, Walter Bright, Grzegorz Adam Hankiewicz, Thomas Kühne, Andrei Alexandrescu


Boost License 1.0