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cleaner array/pointer ctor for string ranges

master
Daniel Kolesa 2017-02-17 17:50:44 +01:00
parent 8e40841219
commit 0977b35fd2
1 changed files with 14 additions and 17 deletions
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31
ostd/string.hh
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@ -31,37 +31,34 @@ struct basic_char_range: input_range<basic_char_range<T>> {
using difference_type = ptrdiff_t;
private:
struct Nat {};
struct nat {};
public:
basic_char_range(): p_beg(nullptr), p_end(nullptr) {};
basic_char_range(T *beg, T *end): p_beg(beg), p_end(end) {}
template<typename U>
basic_char_range(
U beg, std::enable_if_t<
std::is_convertible_v<U, T *> && !std::is_array_v<U>, Nat
> = Nat()
): p_beg(beg), p_end(static_cast<T *>(beg) + (beg ? TR::length(beg) : 0)) {}
basic_char_range(std::nullptr_t): p_beg(nullptr), p_end(nullptr) {}
template<typename U, size_t N>
basic_char_range(U (&beg)[N], std::enable_if_t<
std::is_convertible_v<U *, T *>, Nat
> = Nat()):
p_beg(beg), p_end(beg + N - (beg[N - 1] == '\0'))
{}
template<typename U>
basic_char_range(U &&beg, std::enable_if_t<
std::is_convertible_v<U, T *>, nat
> = nat{}): p_beg(beg) {
if constexpr(std::is_array_v<std::remove_reference_t<U>>) {
size_t N = std::extent_v<std::remove_reference_t<U>>;
p_end = beg + N - (beg[N - 1] == '\0');
} else {
p_end = beg + (beg ? TR::length(beg) : 0);
}
}
template<typename STR, typename A>
basic_char_range(std::basic_string<std::remove_const_t<T>, STR, A> const &s):
p_beg(s.data()), p_end(s.data() + s.size())
{}
template<typename U, typename = std::enable_if_t<
template<typename U, typename TTR, typename = std::enable_if_t<
std::is_convertible_v<U *, T *>
>>
basic_char_range(basic_char_range<U> const &v):
basic_char_range(basic_char_range<U, TTR> const &v):
p_beg(&v[0]), p_end(&v[v.size()])
{}