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#pragma once
#include <stddef.h>
class String {
public:
String();
String(const char * c_str);
String(const String &);
~String();
public:
static String fmt(const char * fmt, ...);
public:
const char * c_str() const;
char * data() const;
size_t size() const;
bool empty() const;
private:
void set(const char * data);
void set(const char * data, size_t data_len);
private:
char * _data = nullptr;
size_t _data_len = 0;
};
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