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#pragma once
#include <algorithm>
#include <cassert>
#include <cstddef>
#include <iterator>
#include <string_view>
#include <type_traits>
namespace OpenVic {
template<std::size_t N>
struct StringLiteral {
constexpr StringLiteral(const char (&str)[N]) {
std::copy_n(str, N, value);
}
consteval StringLiteral(std::string_view string) {
assert(string.size() == N);
std::copy_n(string.begin(), N, value);
}
char value[N];
static const constexpr std::integral_constant<std::size_t, N - 1> size {};
struct iterator {
using iterator_concept [[maybe_unused]] = std::contiguous_iterator_tag;
using difference_type = std::ptrdiff_t;
using element_type = const char; // element_type is a reserved name that must be used in the definition
using pointer = element_type*;
using reference = element_type&;
constexpr iterator() = default;
constexpr iterator(pointer p) : _ptr(p) {}
constexpr reference operator*() const {
return *_ptr;
}
constexpr pointer operator->() const {
return _ptr;
}
constexpr auto& operator++() {
_ptr++;
return *this;
}
constexpr auto operator++(int) {
auto tmp = *this;
++(*this);
return tmp;
}
constexpr iterator& operator+=(int i) {
_ptr += i;
return *this;
}
constexpr iterator operator+(const difference_type other) const {
return _ptr + other;
}
constexpr friend iterator operator+(const difference_type value, iterator const& other) {
return other + value;
}
constexpr iterator& operator--() {
_ptr--;
return *this;
}
constexpr iterator operator--(int) {
iterator tmp = *this;
--(*this);
return tmp;
}
constexpr iterator& operator-=(int i) {
_ptr -= i;
return *this;
}
constexpr difference_type operator-(iterator const& other) const {
return _ptr - other._ptr;
}
constexpr iterator operator-(const difference_type other) const {
return _ptr - other;
}
friend iterator operator-(const difference_type value, iterator const& other) {
return other - value;
}
constexpr reference operator[](difference_type idx) const {
return _ptr[idx];
}
constexpr auto operator<=>(iterator const&) const = default; // three-way comparison C++20
private:
pointer _ptr;
};
constexpr iterator begin() const {
return iterator { &value };
}
constexpr iterator end() const {
return iterator { &value + N };
}
constexpr operator std::string_view() const {
return std::string_view { value, N };
}
constexpr decltype(auto) data() const {
return static_cast<std::string_view>(*this).data();
}
};
}
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