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#pragma once
#include "types.h"
constexpr size_t strlen(const char *str) {
int len = 0;
while (str[len])
++len;
return len;
}
/* reverse: reverse string s in place */
constexpr void reverse(char s[]) {
int i, j;
char c;
for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
}
}
/* itoa: convert n to characters in s */
template <int base = 10> constexpr void itoa(int n, char s[]) {
int i, sign;
if ((sign = n) < 0) /* record sign */
n = -n; /* make n positive */
i = 0;
do { /* generate digits in reverse order */
s[i++] = "0123456789abcdef"[n % base]; /* get next digit */
} while ((n /= base) > 0); /* delete it */
if (sign < 0)
s[i++] = '-';
s[i] = '\0';
reverse(s);
}
class String {
public:
class Iterator {
friend class String;
public:
char next() { return p->buffer[pos++]; }
operator bool() const { return (pos < p->m_length); }
private:
Iterator(const String *s) : p(s) {}
size_t pos = 0;
const String *p;
};
friend class Iterator;
String(const char *d) : buffer{d}, m_length{strlen(d)} {}
String(const char *d, size_t l) : buffer{d}, m_length{l} {}
Iterator begin() const { return Iterator(this); }
private:
const char *const buffer;
const size_t m_length;
};
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