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ton/tdutils/td/utils/Slice-decl.h
2019-09-07 14:33:36 +04:00

225 lines
5.6 KiB
C++

/*
This file is part of TON Blockchain Library.
TON Blockchain Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
TON Blockchain Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with TON Blockchain Library. If not, see <http://www.gnu.org/licenses/>.
Copyright 2017-2019 Telegram Systems LLP
*/
#pragma once
#include "td/utils/common.h"
#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(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 fill(char c);
void fill_zero();
void fill_zero_secure();
void copy_from(Slice from);
char &back();
char &operator[](size_t i);
static const size_t npos = string::npos;
};
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> = {});
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(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) {
}
Slice &operator=(string &&s) = delete;
template <size_t N>
constexpr Slice &operator=(char (&a)[N]) = delete;
template <size_t N>
constexpr Slice &operator=(const char (&a)[N]) {
s_ = a;
len_ = N - 1;
return *this;
}
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;
static const size_t npos = string::npos;
};
bool operator==(const Slice &a, const Slice &b);
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("") {
}
CSlice &operator=(string &&s) = delete;
template <size_t N>
constexpr CSlice &operator=(char (&a)[N]) = delete;
template <size_t N>
constexpr CSlice &operator=(const char (&a)[N]) {
this->Slice::operator=(a);
return *this;
}
const char *c_str() const {
return begin();
}
};
struct SliceHash {
std::size_t operator()(Slice slice) const;
};
} // namespace td