Hi,
i have a function like this:
```
import std.algorithm.iteration : substitute;
//...
string replace(string content, string[] searches , string
replace) {
if(searches.empty) return content;
auto result = content.substitute(searches.front,replace);
for(size_t i=1; i < searches.length; i++) {
searches.popFront();
result = result.substitute(searches.front,replace);
}
//...
return "example return";
}
```
I do not understand why this is not valid. This is the
compilation Error:
```
/home/mab/dlang/dmd-2.089.1/linux/bin64/../../src/phobos/std/algorithm/iteration.d(5954,48):
Error: template std.algorithm.searching.find cannot deduce function from
argument types !(__lambda196)(Result, string), candidates are:
/home/mab/dlang/dmd-2.089.1/linux/bin64/../../src/phobos/std/algorithm/searching.d(1557,12):
find(alias pred = "a == b", InputRange, Element)(InputRange haystack,
scope Element needle)
with pred = __lambda196,
InputRange = Result,
Element = string
must satisfy the following constraint:
is(typeof(binaryFun!pred(haystack.front, needle)) : bool)
/home/mab/dlang/dmd-2.089.1/linux/bin64/../../src/phobos/std/algorithm/searching.d(1823,12):
find(alias pred, InputRange)(InputRange haystack)
/home/mab/dlang/dmd-2.089.1/linux/bin64/../../src/phobos/std/algorithm/searching.d(1877,4):
find(alias pred = "a == b", R1, R2)(R1 haystack, scope R2 needle)
with pred = __lambda196,
R1 = Result,
R2 = string
must satisfy the following constraint:
isForwardRange!R1
/home/mab/dlang/dmd-2.089.1/linux/bin64/../../src/phobos/std/algorithm/searching.d(2329,23):
find(alias pred = "a == b", Range, Ranges...)(Range haystack, Ranges
needles)
with pred = __lambda196,
Range = Result,
Ranges = (string)
must satisfy the following constraint:
Ranges.length > 1
/home/mab/dlang/dmd-2.089.1/linux/bin64/../../src/phobos/std/algorithm/searching.d(2444,19):
find(RandomAccessRange, alias pred, InputRange)(RandomAccessRange
haystack, scope BoyerMooreFinder!(pred, InputRange) needle)
source/app.d(44,29): Error: template instance
std.algorithm.iteration.substitute!((a, b) => a == b, Result,
string, string) error instantiating
source/app.d(44,29): Error: cannot implicitly convert expression
substitute(result, front(searches), replace) of type
std.algorithm.iteration.joiner!(MapResult!(__lambda7,
SubstituteSplitter)).joiner.Result to
std.algorithm.iteration.joiner!(MapResult!(__lambda7,
SubstituteSplitter)).joiner.Result
/home/mab/dlang/dmd-2.089.1/linux/bin64/dmd failed with exit code
1.
```
Can someone explain what is going on? Specially this part:
"Error: cannot implicitly convert expression substitute(result,
front(searches), replace) of type
std.algorithm.iteration.joiner!(MapResult!(__lambda7,
SubstituteSplitter)).joiner.Result to
std.algorithm.iteration.joiner!(MapResult!(__lambda7,
SubstituteSplitter)).joiner.Result"
In the Example "Multiple substitutes" in
https://dlang.org/phobos/std_algorithm_iteration.html#.substitute.substitute i understand that a call to substitute() can be made on the result of substitute().
Thanks
BTW: can sourcecode be formated in this forum somehow?
