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Template std.functional.unaryFun
Transforms a string representing an expression into a unary
function. The string must either use symbol name a as
the parameter or provide the symbol via the parmName argument.
If fun is not a string, unaryFunfun.
Arguments
template unaryFun(alias fun, string parmName);
Example
// Strings are compiled into functions:
alias isEven = unaryFun!("(a & 1) == 0");
assert(isEven(2) && !isEven(1));