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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; using difference_type = ptrdiff_t;
private: private:
struct Nat {}; struct nat {};
public: public:
basic_char_range(): p_beg(nullptr), p_end(nullptr) {}; basic_char_range(): p_beg(nullptr), p_end(nullptr) {};
basic_char_range(T *beg, T *end): p_beg(beg), p_end(end) {} 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) {} basic_char_range(std::nullptr_t): p_beg(nullptr), p_end(nullptr) {}
template<typename U, size_t N> template<typename U>
basic_char_range(U (&beg)[N], std::enable_if_t< basic_char_range(U &&beg, std::enable_if_t<
std::is_convertible_v<U *, T *>, Nat std::is_convertible_v<U, T *>, nat
> = Nat()): > = nat{}): p_beg(beg) {
p_beg(beg), p_end(beg + N - (beg[N - 1] == '\0')) 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> template<typename STR, typename A>
basic_char_range(std::basic_string<std::remove_const_t<T>, STR, A> const &s): 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()) 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 *> 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()]) p_beg(&v[0]), p_end(&v[v.size()])
{} {}