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Template std.functional.partial
Partially applies fun by tying its first argument to arg.
Arguments
template partial(alias fun, alias arg);
Example
int fun(int a, int b) { return a + b; }
alias partial!(fun, 5) fun5;
assert(fun5(6) == 11);
Note that in most cases you'd use an alias instead of a value assignment. Using an alias allows you to partially evaluate template functions without committing to a particular type of the function.