OctaForge
/
libostd
1
0
Fork 1
Code Issues Pull Requests Releases Wiki Activity

IsOutputRange will now test for presence of the right 'put' method, enabling IsOutputRange tests on hybrid ranges (i.e. input ranges that satisfy output requirements)

master
Daniel Kolesa 2015-05-23 22:24:12 +01:00
parent 7589a93539
commit 329aefdecd
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
octa/range.h
View File

@ -79,9 +79,19 @@ namespace octa {
// is output range
template<typename T, bool = IsConvertible<
RangeCategory<T>, OutputRangeTag
>::value> struct IsOutputRange: False {};
template<typename T, typename P>
struct __OctaOutputRangeTest {
template<typename U, void (U::*)(P)> struct __OctaTest {};
template<typename U> static char __octa_test(__OctaTest<U, &U::put> *);
template<typename U> static int __octa_test(...);
static constexpr bool value = (sizeof(__octa_test<T>(0)) == sizeof(char));
};
template<typename T, bool
= (IsConvertible<RangeCategory<T>, OutputRangeTag>::value ||
__OctaOutputRangeTest<T, const RangeValue<T> &>::value ||
__OctaOutputRangeTest<T, RangeValue<T> &&>::value)
> struct IsOutputRange: False {};
template<typename T>
struct IsOutputRange<T, true>: True {};