mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-12-22 05:16:21 +00:00
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
parent
9ccda98e6e
commit
b8f1f113f3
@ -14,7 +14,6 @@
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#define ENCODING_H
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#include "support/docstring.h"
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#include "support/trivstring.h"
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#include "support/types.h"
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#include <map>
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@ -16,7 +16,6 @@
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#define LANGUAGE_H
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#include "support/docstring.h"
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#include "support/trivstring.h"
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#include <map>
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#include <set>
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@ -115,8 +115,6 @@ liblyxsupport_a_SOURCES = \
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Translator.h \
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Timeout.cpp \
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Timeout.h \
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trivstring.cpp \
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trivstring.h \
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types.h \
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unique_ptr.h \
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userinfo.cpp \
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@ -65,14 +65,11 @@ std::string const & empty_string();
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// defined in docstring.cpp
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bool operator==(docstring const &, char const *);
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#ifdef STD_STRING_USES_COW
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template<typename Char> class trivial_string;
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typedef trivial_string<char> trivstring;
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typedef trivial_string<char_type> trivdocstring;
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#else
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//trivstring signalizes thread-safety request; should not be needed for any
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//C++11 conformant std::basic_string, e.g. GCC >= 5.
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//Once properly tested we can ditch these two in favour of std::string/docstring.
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typedef std::string trivstring;
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typedef docstring trivdocstring;
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#endif
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} // namespace lyx
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@ -1,6 +1,5 @@
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#include <config.h>
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#include "../trivstring.h"
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#include "../docstring.h"
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#include <iostream>
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@ -1,261 +0,0 @@
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/**
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* \file trivstring.cpp
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Georg Baum
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*
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* Full author contact details are available in file CREDITS.
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*/
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#include <config.h>
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#include "support/trivstring.h"
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#include "support/docstring.h"
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#ifdef STD_STRING_USES_COW
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#include <algorithm>
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#include <stdexcept>
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using namespace std;
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namespace lyx {
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template trivial_string<char>::trivial_string(trivial_string const &);
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template trivial_string<char_type>::trivial_string(trivial_string const &);
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template<typename Char>
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trivial_string<Char>::trivial_string(trivial_string const & that) : size_(that.size_)
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{
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if (use_sso())
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copy(that.data_sso(), that.data_sso() + size_ + 1, data_sso());
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else if (size_ > 0) {
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data_ = new Char[size_ + 1];
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copy(that.data_, that.data_ + size_ + 1, data_);
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} else {
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// Happens only for really big Char types
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data_ = 0;
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}
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}
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template<typename Char>
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trivial_string<Char>::trivial_string(Char const * that, size_t n) : size_(n)
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{
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if (use_sso()) {
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copy(that, that + size_, data_sso());
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data_sso()[size_] = '\0';
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} else if (size_ > 0) {
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data_ = new Char[size_ + 1];
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copy(that, that + size_, data_);
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data_[size_] = '\0';
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} else {
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// Happens only for really big Char types
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data_ = 0;
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}
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}
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template trivial_string<char>::trivial_string(string const &);
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template trivial_string<char_type>::trivial_string(docstring const &);
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template<typename Char>
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trivial_string<Char>::trivial_string(_stdstring const & that)
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: size_(that.length())
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{
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if (use_sso()) {
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copy(that.begin(), that.end(), data_sso());
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data_sso()[size_] = '\0';
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} else if (size_ > 0) {
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data_ = new Char[size_ + 1];
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copy(that.begin(), that.end(), data_);
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data_[size_] = '\0';
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} else {
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// Happens only for really big Char types
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data_ = 0;
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}
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}
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template trivial_string<char> &
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trivial_string<char>::operator=(trivial_string const &);
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template trivial_string<char_type> &
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trivial_string<char_type>::operator=(trivial_string const &);
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template<typename Char>
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trivial_string<Char> & trivial_string<Char>::operator=(trivial_string const & that)
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{
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if (&that == this)
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return *this;
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if (!use_sso())
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delete[] data_;
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size_ = that.size_;
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if (use_sso())
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copy(that.data_sso(), that.data_sso() + size_ + 1, data_sso());
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else if (size_ > 0) {
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data_ = new Char[size_ + 1];
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copy(that.data_, that.data_ + size_ + 1, data_);
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} else {
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// Happens only for really big Char types
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data_ = 0;
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}
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return *this;
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}
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template trivial_string<char> &
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trivial_string<char>::operator=(string const &);
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template trivial_string<char_type> &
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trivial_string<char_type>::operator=(docstring const &);
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template<typename Char>
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trivial_string<Char> &
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trivial_string<Char>::operator=(_stdstring const & that)
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{
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if (!use_sso())
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delete[] data_;
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size_ = that.size();
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if (use_sso()) {
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copy(that.begin(), that.end(), data_sso());
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data_sso()[size_] = '\0';
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} else if (size_ > 0) {
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data_ = new Char[size_ + 1];
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copy(that.begin(), that.end(), data_);
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} else {
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// Happens only for really big Char types
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data_ = 0;
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}
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return *this;
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}
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template void
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trivial_string<char>::swap(trivial_string<char> &);
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template void
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trivial_string<char_type>::swap(trivial_string<char_type> &);
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template<typename Char>
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void trivial_string<Char>::swap(trivial_string & that)
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{
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size_t const sizetmp = that.size_;
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that.size_ = size_;
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size_ = sizetmp;
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Char * const datatmp = that.data_;
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that.data_ = data_;
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data_ = datatmp;
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}
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template<typename Char>
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int trivial_string<Char>::compare(trivial_string const & other) const
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{
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size_t const lsize = this->length();
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size_t const rsize = other.length();
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size_t const len = min(lsize, rsize);
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int r = char_traits<Char>::compare(c_str(), other.c_str(), len);
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if (r == 0) {
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if (lsize > rsize)
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r = 1;
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else if (lsize < rsize)
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r = -1;
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}
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return r;
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}
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template trivial_string<char> trivial_string<char>::substr(size_t, size_t) const;
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template trivial_string<char_type> trivial_string<char_type>::substr(size_t, size_t) const;
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template<typename Char>
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trivial_string<Char> trivial_string<Char>::substr(size_t pos, size_t n) const
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{
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if (pos > length())
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throw out_of_range("trivial_string::substr");
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if (n == _stdstring::npos)
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n = length() - pos;
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size_t const l = min(pos + n, length());
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return trivial_string(c_str() + pos, l - pos);
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}
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template trivial_string<char>::operator string() const;
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template trivial_string<char_type>::operator docstring() const;
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template<typename Char>
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trivial_string<Char>::operator _stdstring() const
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{
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if (use_sso())
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return _stdstring(data_sso(), size_);
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if (size_ > 0)
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return _stdstring(data_, size_);
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// Happens only for really big Char types
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return _stdstring();
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}
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template char const * trivial_string<char>::c_str() const;
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template char_type const * trivial_string<char_type>::c_str() const;
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template<typename Char> Char const * trivial_string<Char>::c_str() const
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{
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if (use_sso())
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return data_sso();
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if (size_ > 0)
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return data_;
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// Happens only for really big Char types
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static const Char empty_char = '\0';
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return &empty_char;
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}
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template char trivial_string<char>::operator[](size_t) const;
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template char_type trivial_string<char_type>::operator[](size_t) const;
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template <typename Char> Char trivial_string<Char>::operator[](size_t i) const
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{
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return c_str()[i];
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}
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template bool operator<(trivial_string<char> const &,
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trivial_string<char> const &);
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template bool operator<(trivial_string<char_type> const &,
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trivial_string<char_type> const &);
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template <typename Char>
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bool operator<(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs)
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{
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return lhs.compare(rhs) < 0;
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}
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template bool operator==(trivial_string<char> const &,
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trivial_string<char> const &);
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template bool operator==(trivial_string<char_type> const &,
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trivial_string<char_type> const &);
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template <typename Char>
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bool operator==(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs)
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{
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return lhs.compare(rhs) == 0;
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}
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template bool operator==(trivial_string<char> const &, char const *);
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template bool operator==(trivial_string<char_type> const &, char_type const *);
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template <typename Char>
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bool operator==(trivial_string<Char> const & lhs, Char const * rhs)
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{
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return lhs.compare(trivial_string<Char>(rhs)) == 0;
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}
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template bool operator==(char const *, trivial_string<char> const &);
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template bool operator==(char_type const *, trivial_string<char_type> const &);
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template <typename Char>
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bool operator==(Char const * lhs, trivial_string<Char> const & rhs)
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{
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return rhs.compare(trivial_string<Char>(lhs)) == 0;
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}
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template ostream & operator<<(ostream &, trivial_string<char> const &);
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template odocstream & operator<<(odocstream &, trivial_string<char_type> const &);
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template <typename Char>
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basic_ostream<Char, char_traits<Char> > &
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operator<<(basic_ostream<Char, char_traits<Char> > & os, trivial_string<Char> const & s)
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{
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return os << basic_string<Char, char_traits<Char>, allocator<Char> >(s);
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}
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} // namespace lyx
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#endif
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@ -1,114 +0,0 @@
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// -*- C++ -*-
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/**
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* \file trivstring.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Georg Baum
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef LYX_TRIVSTRING_H
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#define LYX_TRIVSTRING_H
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#ifdef STD_STRING_USES_COW
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#include <cstdlib>
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namespace lyx {
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/**
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* Trivial string class with almost no features.
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* The public interface is a subset of the std::basic_string interface.
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* The only important feature is that any read-only access does not need
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* synchronization between multiple threads, i.e. it is thread-safe without
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* locking.
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* Therefore you can safely use a const trivial_string object in multiple
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* threads at the same time. This is not the case for std::basic_string in some
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* STL implementations (e. g. GNU libcstd++, see bug 9336 and
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21334.
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* This class should not be used for anything else than providing thread-safety.
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* It should be removed as soon as LyX requires C++11, and all supported STL
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* implementations provide a C++11 conformant std::basic_string.
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*
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* If you change anything in this class please ensure that the unit test
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* tests/check_trivstring.cpp still tests 100% of the public interface.
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*/
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template <typename Char> class trivial_string
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{
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public:
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/// Corresponding std::basic_string
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typedef std::basic_string<Char, std::char_traits<Char>, std::allocator<Char> > _stdstring;
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/// Construct an empty string
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trivial_string() : size_(0), data_(0) {}
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/// Construct a string from a copy of \p that
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trivial_string(trivial_string const & that);
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/// Construct a string from a copy of \p that
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trivial_string(Char const * that, size_t n);
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/// Construct a string from a copy of \p that
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trivial_string(_stdstring const & that);
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///
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~trivial_string() { if (!use_sso()) delete[] data_; }
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/// Assign a copy of \p that
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trivial_string & operator=(trivial_string const & that);
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/// Assign a copy of \p that
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trivial_string & operator=(_stdstring const & that);
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/// Exchange contents with contents of \p that
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void swap(trivial_string & that);
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/// The length of the string, excluding the final 0 character
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size_t length() const { return size_; }
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/// Is this string empty?
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bool empty() const { return size_ == 0; }
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/// Is this string ordered before, at the same position or after \p other?
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int compare(trivial_string const & other) const;
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/// Return substring of length \p n starting at \p pos
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trivial_string substr(size_t pos = 0, size_t n = _stdstring::npos) const;
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/// Create a copy as std::basic_string
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operator _stdstring() const;
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/// Return a C-compatible string, terminated by a 0 character.
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/// This is never a copy and only valid for the life time of the trivial_string instance.
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Char const * c_str() const;
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/// Return character at position \p i (validity of \i is not checked)
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Char operator[](size_t i) const;
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private:
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/**
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* Whether short string optimization is used.
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* Short string optimization is a technique where no additional memory
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* needs to be allocated to store the string contents.
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* Instead, the memory which would be used to store the pointer to the
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* character buffer is reinterpreted to be a Char * buffer.
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* On most 64 bit systems and with Char == char this allows to store
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* strings of up to 7 characters without allocating additional memory.
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*/
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bool use_sso() const { return (size_ + 1) * sizeof(Char) <= sizeof(Char *); }
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/// The character storage if sso is used
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Char * data_sso() { return reinterpret_cast<Char * >(&data_); }
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/// The character storage if sso is used
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Char const * data_sso() const { return reinterpret_cast<Char const *>(&data_); }
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/// The length of the string, excluding the final 0 character
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size_t size_;
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/// The character storage
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Char * data_;
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};
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/// Comparison operator (needed for std::set etc)
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template <typename Char> bool operator<(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs);
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/// Equality operator
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template <typename Char> bool operator==(trivial_string<Char> const & lhs, trivial_string<Char> const & rhs);
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template <typename Char> bool operator==(trivial_string<Char> const & lhs, Char const * rhs);
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template <typename Char> bool operator==(Char const * lhs, trivial_string<Char> const & rhs);
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/// Stream output operator
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template <typename Char>
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std::basic_ostream<Char, std::char_traits<Char> > &
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operator<<(std::basic_ostream<Char, std::char_traits<Char> > &, trivial_string<Char> const &);
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} // namespace lyx
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#else
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#include <string>
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#endif
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#endif
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