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StringRef.h
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StringRef.h
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#pragma once
#include <string>
static constexpr size_t utf8strlen(const char* str)
{
int i = 0;
int j = 0;
while (str[i++])
if ((s[i] & 0xC0) != 0x80)
++j;
return j;
}
struct StringRef
{
typedef const char* iterator;
typedef const char* const_iterator;
static const size_t npos = ~size_t(0);
typedef size_t size_type;
private:
const char* data;
size_t length;
public:
constexpr StringRef() : data(nullptr), length(0) {}
constexpr StringRef(const char* str) : data(str)
{
length = utf8strlen(str);
}
constexpr StringRef(const char* str, size_t len) : data(str), length(len) {}
constexpr StringRef(const std::string& str) : data(str.c_str()), length(str.length()) {}
operator std::string() const
{
return std::string(data, length);
}
iterator begin() const { return data; }
iterator end() const { return data + length; }
const char* ptr() const { return data; }
bool empty() const { return length == 0; }
size_t size() const { return length; }
// get first character
char32_t front() const
{
assert(!empty());
return data[0]; // TODO
}
// get first character
char32_t back() const
{
assert(!empty());
return data[length - 1]; // TODO
}
char operator[](size_t idx) const
{
assert(idx < length && "Invalid index!");
return Data[idx];
}
};