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License: Boost Software License 1.0
Header-only, single file, C++11 compatible version of `enumerate`.
License: Boost Software License 1.0
#define HIPONY_ENUMERATE_HAS_NODISCARD HIPONY_ENUMERATE_CPP17_OR_GREATER
Use __has_cpp_attribute
instead
hipony::enumerate
type is not std::ranges::range
, so there is no way to use ranges algorithmstemplate<typename Self>
concept range = requires(Self& self)
{
ranges::begin(self);
ranges::end(self);
};
ranges::begin
(or ranges::end
) requires the follow concepttemplate<typename Self>
concept __member_begin = requires(Self& self)
{
{self.begin()} -> input_or_output_iterator;
};
input_or_output_iterator
, and then to weakly_incrementible
This is a small example of an iterator and ranges collection
struct iter
{
using difference_type = std::ptrdiff_t;
iter() = default;
iter& operator++() {}
/*any type*/ auto operator++(int) {}
/*non-void*/ int& operator*() {}
bool operator==(const iter& other) const {} // automatically matching operator!=
};
static_assert(std::weakly_incrementable<iter>);
struct collection
{
auto begin() { return iter{}; }
auto end() { return iter{}; }
};
static_assert(std::ranges::range<collection>);
for (auto&& [index, value] : enumerate(vec.begin(), vec.end()) {}
for (auto&& [index, value] : enumerate(container, &Item::member)) {}
for (auto&& [index, value] : enumerate({0, 1, 2, 3, 4, 5}) {}
enumerate(aggregate).each([](auto index, auto& value) {
...
});
for (auto&& [index, value] : enumerate(vec, size)) {}
When I'd need to use the same classes under the same namespace - I need a way to reuse them rather than causing a multiple definitions error.
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