[Issue 7992] New: std.algorithm.find breaks in certain circumstances
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Thu Apr 26 14:56:32 PDT 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7992
Summary: std.algorithm.find breaks in certain circumstances
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: nobody at puremagic.com
ReportedBy: nyphbl8d at gmail.com
--- Comment #0 from William Moore <nyphbl8d at gmail.com> 2012-04-26 14:57:31 PDT ---
When std.algorithm.find is used with a type that forces it to use
simpleMindedFind and the type in question supports the length attribute,
simpleMindedFind will throw an assert if the string to be searched does not
contain the search string.
For example:
struct omgstring {
string data;
// Start hasLength functions
@property {
size_t length() const {return data.length;}
void length(size_t len) {data.length = len;}
}
// End hasLength functions
// Start InputRange functions
bool empty() const {return data.empty();}
dchar front() const {return data.front();}
void popFront() {data.popFront();}
// End InputRange functions
// Start ForwardRange functions (implies InputRange)
mycustring save() {return this;}
// End ForwardRange functions
}
// succeeds
simpleMindedFind!"a == b"("a","b");
// throws assert when it pops past the last element
simpleMindedFind!"a == b"(to!omgstring("a"),to!omgstring("b"));
Note that I'm not actually calling simpleMindedFind directly, but that is the
function the code ends up in when throwing the assert. The code executes
correctly if the length property is removed.
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