Remove trivstring.

Needed in times when std:string was not thread-safe,
but should be ok nowadays.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21334
https://www.mail-archive.com/lyx-devel@lists.lyx.org/msg223068.html
This commit is contained in:
Pavel Sanda 2024-10-04 20:49:55 +02:00
parent 9ccda98e6e
commit b8f1f113f3
7 changed files with 3 additions and 386 deletions

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@ -14,7 +14,6 @@
#define ENCODING_H
#include "support/docstring.h"
#include "support/trivstring.h"
#include "support/types.h"
#include <map>

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@ -16,7 +16,6 @@
#define LANGUAGE_H
#include "support/docstring.h"
#include "support/trivstring.h"
#include <map>
#include <set>

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@ -115,8 +115,6 @@ liblyxsupport_a_SOURCES = \
Translator.h \
Timeout.cpp \
Timeout.h \
trivstring.cpp \
trivstring.h \
types.h \
unique_ptr.h \
userinfo.cpp \

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@ -65,14 +65,11 @@ std::string const & empty_string();
// defined in docstring.cpp
bool operator==(docstring const &, char const *);
#ifdef STD_STRING_USES_COW
template<typename Char> class trivial_string;
typedef trivial_string<char> trivstring;
typedef trivial_string<char_type> trivdocstring;
#else
//trivstring signalizes thread-safety request; should not be needed for any
//C++11 conformant std::basic_string, e.g. GCC >= 5.
//Once properly tested we can ditch these two in favour of std::string/docstring.
typedef std::string trivstring;
typedef docstring trivdocstring;
#endif
} // namespace lyx

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@ -1,6 +1,5 @@
#include <config.h>
#include "../trivstring.h"
#include "../docstring.h"
#include <iostream>

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@ -1,261 +0,0 @@
/**
* \file trivstring.cpp
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Georg Baum
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "support/trivstring.h"
#include "support/docstring.h"
#ifdef STD_STRING_USES_COW
#include <algorithm>
#include <stdexcept>
using namespace std;
namespace lyx {
template trivial_string<char>::trivial_string(trivial_string const &);
template trivial_string<char_type>::trivial_string(trivial_string const &);
template<typename Char>
trivial_string<Char>::trivial_string(trivial_string const & that) : size_(that.size_)
{
if (use_sso())
copy(that.data_sso(), that.data_sso() + size_ + 1, data_sso());
else if (size_ > 0) {
data_ = new Char[size_ + 1];
copy(that.data_, that.data_ + size_ + 1, data_);
} else {
// Happens only for really big Char types
data_ = 0;
}
}
template<typename Char>
trivial_string<Char>::trivial_string(Char const * that, size_t n) : size_(n)
{
if (use_sso()) {
copy(that, that + size_, data_sso());
data_sso()[size_] = '\0';
} else if (size_ > 0) {
data_ = new Char[size_ + 1];
copy(that, that + size_, data_);
data_[size_] = '\0';
} else {
// Happens only for really big Char types
data_ = 0;
}
}
template trivial_string<char>::trivial_string(string const &);
template trivial_string<char_type>::trivial_string(docstring const &);
template<typename Char>
trivial_string<Char>::trivial_string(_stdstring const & that)
: size_(that.length())
{
if (use_sso()) {
copy(that.begin(), that.end(), data_sso());
data_sso()[size_] = '\0';
} else if (size_ > 0) {
data_ = new Char[size_ + 1];
copy(that.begin(), that.end(), data_);
data_[size_] = '\0';
} else {
// Happens only for really big Char types
data_ = 0;
}
}
template trivial_string<char> &
trivial_string<char>::operator=(trivial_string const &);
template trivial_string<char_type> &
trivial_string<char_type>::operator=(trivial_string const &);
template<typename Char>
trivial_string<Char> & trivial_string<Char>::operator=(trivial_string const & that)
{
if (&that == this)
return *this;
if (!use_sso())
delete[] data_;
size_ = that.size_;
if (use_sso())
copy(that.data_sso(), that.data_sso() + size_ + 1, data_sso());
else if (size_ > 0) {
data_ = new Char[size_ + 1];
copy(that.data_, that.data_ + size_ + 1, data_);
} else {
// Happens only for really big Char types
data_ = 0;
}
return *this;
}
template trivial_string<char> &
trivial_string<char>::operator=(string const &);
template trivial_string<char_type> &
trivial_string<char_type>::operator=(docstring const &);
template<typename Char>
trivial_string<Char> &
trivial_string<Char>::operator=(_stdstring const & that)
{
if (!use_sso())
delete[] data_;
size_ = that.size();
if (use_sso()) {
copy(that.begin(), that.end(), data_sso());
data_sso()[size_] = '\0';
} else if (size_ > 0) {
data_ = new Char[size_ + 1];
copy(that.begin(), that.end(), data_);
} else {
// Happens only for really big Char types
data_ = 0;
}
return *this;
}
template void
trivial_string<char>::swap(trivial_string<char> &);
template void
trivial_string<char_type>::swap(trivial_string<char_type> &);
template<typename Char>
void trivial_string<Char>::swap(trivial_string & that)
{
size_t const sizetmp = that.size_;
that.size_ = size_;
size_ = sizetmp;
Char * const datatmp = that.data_;
that.data_ = data_;
data_ = datatmp;
}
template<typename Char>
int trivial_string<Char>::compare(trivial_string const & other) const
{
size_t const lsize = this->length();
size_t const rsize = other.length();
size_t const len = min(lsize, rsize);
int r = char_traits<Char>::compare(c_str(), other.c_str(), len);
if (r == 0) {
if (lsize > rsize)
r = 1;
else if (lsize < rsize)
r = -1;
}
return r;
}
template trivial_string<char> trivial_string<char>::substr(size_t, size_t) const;
template trivial_string<char_type> trivial_string<char_type>::substr(size_t, size_t) const;
template<typename Char>
trivial_string<Char> trivial_string<Char>::substr(size_t pos, size_t n) const
{
if (pos > length())
throw out_of_range("trivial_string::substr");
if (n == _stdstring::npos)
n = length() - pos;
size_t const l = min(pos + n, length());
return trivial_string(c_str() + pos, l - pos);
}
template trivial_string<char>::operator string() const;
template trivial_string<char_type>::operator docstring() const;
template<typename Char>
trivial_string<Char>::operator _stdstring() const
{
if (use_sso())
return _stdstring(data_sso(), size_);
if (size_ > 0)
return _stdstring(data_, size_);
// Happens only for really big Char types
return _stdstring();
}
template char const * trivial_string<char>::c_str() const;
template char_type const * trivial_string<char_type>::c_str() const;
template<typename Char> Char const * trivial_string<Char>::c_str() const
{
if (use_sso())
return data_sso();
if (size_ > 0)
return data_;
// Happens only for really big Char types
static const Char empty_char = '\0';
return &empty_char;
}
template char trivial_string<char>::operator[](size_t) const;
template char_type trivial_string<char_type>::operator[](size_t) const;
template <typename Char> Char trivial_string<Char>::operator[](size_t i) const
{
return c_str()[i];
}
template bool operator<(trivial_string<char> const &,
trivial_string<char> const &);
template bool operator<(trivial_string<char_type> const &,
trivial_string<char_type> const &);
template <typename Char>
bool operator<(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs)
{
return lhs.compare(rhs) < 0;
}
template bool operator==(trivial_string<char> const &,
trivial_string<char> const &);
template bool operator==(trivial_string<char_type> const &,
trivial_string<char_type> const &);
template <typename Char>
bool operator==(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs)
{
return lhs.compare(rhs) == 0;
}
template bool operator==(trivial_string<char> const &, char const *);
template bool operator==(trivial_string<char_type> const &, char_type const *);
template <typename Char>
bool operator==(trivial_string<Char> const & lhs, Char const * rhs)
{
return lhs.compare(trivial_string<Char>(rhs)) == 0;
}
template bool operator==(char const *, trivial_string<char> const &);
template bool operator==(char_type const *, trivial_string<char_type> const &);
template <typename Char>
bool operator==(Char const * lhs, trivial_string<Char> const & rhs)
{
return rhs.compare(trivial_string<Char>(lhs)) == 0;
}
template ostream & operator<<(ostream &, trivial_string<char> const &);
template odocstream & operator<<(odocstream &, trivial_string<char_type> const &);
template <typename Char>
basic_ostream<Char, char_traits<Char> > &
operator<<(basic_ostream<Char, char_traits<Char> > & os, trivial_string<Char> const & s)
{
return os << basic_string<Char, char_traits<Char>, allocator<Char> >(s);
}
} // namespace lyx
#endif

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@ -1,114 +0,0 @@
// -*- C++ -*-
/**
* \file trivstring.h
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Georg Baum
*
* Full author contact details are available in file CREDITS.
*/
#ifndef LYX_TRIVSTRING_H
#define LYX_TRIVSTRING_H
#ifdef STD_STRING_USES_COW
#include <cstdlib>
namespace lyx {
/**
* Trivial string class with almost no features.
* The public interface is a subset of the std::basic_string interface.
* The only important feature is that any read-only access does not need
* synchronization between multiple threads, i.e. it is thread-safe without
* locking.
* Therefore you can safely use a const trivial_string object in multiple
* threads at the same time. This is not the case for std::basic_string in some
* STL implementations (e. g. GNU libcstd++, see bug 9336 and
* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21334.
* This class should not be used for anything else than providing thread-safety.
* It should be removed as soon as LyX requires C++11, and all supported STL
* implementations provide a C++11 conformant std::basic_string.
*
* If you change anything in this class please ensure that the unit test
* tests/check_trivstring.cpp still tests 100% of the public interface.
*/
template <typename Char> class trivial_string
{
public:
/// Corresponding std::basic_string
typedef std::basic_string<Char, std::char_traits<Char>, std::allocator<Char> > _stdstring;
/// Construct an empty string
trivial_string() : size_(0), data_(0) {}
/// Construct a string from a copy of \p that
trivial_string(trivial_string const & that);
/// Construct a string from a copy of \p that
trivial_string(Char const * that, size_t n);
/// Construct a string from a copy of \p that
trivial_string(_stdstring const & that);
///
~trivial_string() { if (!use_sso()) delete[] data_; }
/// Assign a copy of \p that
trivial_string & operator=(trivial_string const & that);
/// Assign a copy of \p that
trivial_string & operator=(_stdstring const & that);
/// Exchange contents with contents of \p that
void swap(trivial_string & that);
/// The length of the string, excluding the final 0 character
size_t length() const { return size_; }
/// Is this string empty?
bool empty() const { return size_ == 0; }
/// Is this string ordered before, at the same position or after \p other?
int compare(trivial_string const & other) const;
/// Return substring of length \p n starting at \p pos
trivial_string substr(size_t pos = 0, size_t n = _stdstring::npos) const;
/// Create a copy as std::basic_string
operator _stdstring() const;
/// Return a C-compatible string, terminated by a 0 character.
/// This is never a copy and only valid for the life time of the trivial_string instance.
Char const * c_str() const;
/// Return character at position \p i (validity of \i is not checked)
Char operator[](size_t i) const;
private:
/**
* Whether short string optimization is used.
* Short string optimization is a technique where no additional memory
* needs to be allocated to store the string contents.
* Instead, the memory which would be used to store the pointer to the
* character buffer is reinterpreted to be a Char * buffer.
* On most 64 bit systems and with Char == char this allows to store
* strings of up to 7 characters without allocating additional memory.
*/
bool use_sso() const { return (size_ + 1) * sizeof(Char) <= sizeof(Char *); }
/// The character storage if sso is used
Char * data_sso() { return reinterpret_cast<Char * >(&data_); }
/// The character storage if sso is used
Char const * data_sso() const { return reinterpret_cast<Char const *>(&data_); }
/// The length of the string, excluding the final 0 character
size_t size_;
/// The character storage
Char * data_;
};
/// Comparison operator (needed for std::set etc)
template <typename Char> bool operator<(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs);
/// Equality operator
template <typename Char> bool operator==(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs);
template <typename Char> bool operator==(trivial_string<Char> const & lhs, Char const * rhs);
template <typename Char> bool operator==(Char const * lhs, trivial_string<Char> const & rhs);
/// Stream output operator
template <typename Char>
std::basic_ostream<Char, std::char_traits<Char> > &
operator<<(std::basic_ostream<Char, std::char_traits<Char> > &, trivial_string<Char> const &);
} // namespace lyx
#else
#include <string>
#endif
#endif