On 08/21/2012 07:05 PM, Andrew Spott wrote:
When I'm doing an anonymous function for something like reduce,
how are the arguments determined? Is it alphabetical? Can I use
any names (reduce!"d-c"(R)?), or are the names defined in the
function "reduce"?
They are defined here:
http://dlang.org/phobos/std_functional.html#binaryFun
This syntax isn't really documented at all in the language
reference, which makes it a little bit of guess work.
This is not part of the language, it is a library artefact:
http://dlang.org/phobos/std_algorithm.html
'Many functions in this module are parameterized with a function or a
predicate. The predicate may be passed either as a function name, a
delegate name, a functor name, or a compile-time string. The string may
consist of any legal D expression that uses the symbol a (for unary
functions) or the symbols a and b (for binary functions). These names
will NOT interfere with other homonym symbols in user code because they
are evaluated in a different context. The default for all binary
comparison predicates is "a == b" for unordered operations and "a < b"
for ordered operations.'
