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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2018
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/utils/common.h"
#include <cstring>
#include <type_traits>
namespace td {
class Slice;
class MutableSlice {
char *s_;
size_t len_;
struct private_tag {};
public:
MutableSlice();
MutableSlice(char *s, size_t len);
MutableSlice(unsigned char *s, size_t len);
MutableSlice(string &s);
template <class T>
explicit MutableSlice(T s, std::enable_if_t<std::is_same<char *, T>::value, private_tag> = {})
: MutableSlice(s, std::strlen(s)) {
}
MutableSlice(char *s, char *t);
MutableSlice(unsigned char *s, unsigned char *t);
template <size_t N>
constexpr MutableSlice(char (&a)[N]) = delete;
bool empty() const;
size_t size() const;
MutableSlice &remove_prefix(size_t prefix_len);
MutableSlice &remove_suffix(size_t suffix_len);
MutableSlice &truncate(size_t size);
MutableSlice copy() const;
char *data() const;
char *begin() const;
unsigned char *ubegin() const;
char *end() const;
unsigned char *uend() const;
string str() const;
MutableSlice substr(size_t from) const;
MutableSlice substr(size_t from, size_t size) const;
size_t find(char c) const;
size_t rfind(char c) const;
void copy_from(Slice from);
char &back();
char &operator[](size_t i);
};
class Slice {
const char *s_;
size_t len_;
struct private_tag {};
public:
Slice();
Slice(const MutableSlice &other);
Slice(const char *s, size_t len);
Slice(const unsigned char *s, size_t len);
Slice(const string &s);
template <class T>
explicit Slice(T s, std::enable_if_t<std::is_same<char *, std::remove_const_t<T>>::value, private_tag> = {})
: Slice(s, std::strlen(s)) {
}
template <class T>
explicit Slice(T s, std::enable_if_t<std::is_same<const char *, std::remove_const_t<T>>::value, private_tag> = {})
: Slice(s, std::strlen(s)) {
}
Slice(const char *s, const char *t);
Slice(const unsigned char *s, const unsigned char *t);
template <size_t N>
constexpr Slice(char (&a)[N]) = delete;
template <size_t N>
constexpr Slice(const char (&a)[N]) : s_(a), len_(N - 1) {
}
bool empty() const;
size_t size() const;
Slice &remove_prefix(size_t prefix_len);
Slice &remove_suffix(size_t suffix_len);
Slice &truncate(size_t size);
Slice copy() const;
const char *data() const;
const char *begin() const;
const unsigned char *ubegin() const;
const char *end() const;
const unsigned char *uend() const;
string str() const;
Slice substr(size_t from) const;
Slice substr(size_t from, size_t size) const;
size_t find(char c) const;
size_t rfind(char c) const;
char back() const;
char operator[](size_t i) const;
};
bool operator==(const Slice &a, const Slice &b);
bool operator!=(const Slice &a, const Slice &b);
class MutableCSlice : public MutableSlice {
struct private_tag {};
MutableSlice &remove_suffix(size_t suffix_len) = delete;
MutableSlice &truncate(size_t size) = delete;
public:
MutableCSlice() = delete;
MutableCSlice(string &s) : MutableSlice(s) {
}
template <class T>
explicit MutableCSlice(T s, std::enable_if_t<std::is_same<char *, T>::value, private_tag> = {}) : MutableSlice(s) {
}
MutableCSlice(char *s, char *t);
template <size_t N>
constexpr MutableCSlice(char (&a)[N]) = delete;
const char *c_str() const {
return begin();
}
};
class CSlice : public Slice {
struct private_tag {};
Slice &remove_suffix(size_t suffix_len) = delete;
Slice &truncate(size_t size) = delete;
public:
explicit CSlice(const MutableSlice &other) : Slice(other) {
}
CSlice(const MutableCSlice &other) : Slice(other.begin(), other.size()) {
}
CSlice(const string &s) : Slice(s) {
}
template <class T>
explicit CSlice(T s, std::enable_if_t<std::is_same<char *, std::remove_const_t<T>>::value, private_tag> = {})
: Slice(s) {
}
template <class T>
explicit CSlice(T s, std::enable_if_t<std::is_same<const char *, std::remove_const_t<T>>::value, private_tag> = {})
: Slice(s) {
}
CSlice(const char *s, const char *t);
template <size_t N>
constexpr CSlice(char (&a)[N]) = delete;
template <size_t N>
constexpr CSlice(const char (&a)[N]) : Slice(a) {
}
CSlice() : CSlice("") {
}
const char *c_str() const {
return begin();
}
};
struct SliceHash {
std::size_t operator()(Slice slice) const;
};
} // namespace td
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