diff --git a/libqpdf/Pl_Flate.cc b/libqpdf/Pl_Flate.cc
index a28a1a3..9a575ad 100644
--- a/libqpdf/Pl_Flate.cc
+++ b/libqpdf/Pl_Flate.cc
@@ -29,7 +29,7 @@ Pl_Flate::Members::Members(size_t out_bufsize, action_e action) :
     // Indirect through zdata to reach the z_stream so we don't have to include zlib.h in
     // Pl_Flate.hh.  This means people using shared library versions of qpdf don't have to have zlib
     // development files available, which particularly helps in a Windows environment.
-    this->zdata = new z_stream;
+    zdata = new z_stream;
 
     if (out_bufsize > UINT_MAX) {
         throw std::runtime_error(
@@ -52,8 +52,8 @@ Pl_Flate::Members::Members(size_t out_bufsize, action_e action) :
 
 Pl_Flate::Members::~Members()
 {
-    if (this->initialized) {
-        z_stream& zstream = *(static_cast<z_stream*>(this->zdata));
+    if (initialized) {
+        z_stream& zstream = *(static_cast<z_stream*>(zdata));
         if (action == a_deflate) {
             deflateEnd(&zstream);
         } else {
@@ -62,7 +62,7 @@ Pl_Flate::Members::~Members()
     }
 
     delete static_cast<z_stream*>(this->zdata);
-    this->zdata = nullptr;
+    zdata = nullptr;
 }
 
 Pl_Flate::Pl_Flate(
@@ -99,7 +99,7 @@ Pl_Flate::setWarnCallback(std::function<void(char const*, int)> callback)
 void
 Pl_Flate::warn(char const* msg, int code)
 {
-    if (m->callback != nullptr) {
+    if (m->callback) {
         m->callback(msg, code);
     }
 }
@@ -107,7 +107,7 @@ Pl_Flate::warn(char const* msg, int code)
 void
 Pl_Flate::write(unsigned char const* data, size_t len)
 {
-    if (m->outbuf == nullptr) {
+    if (!m->outbuf) {
         throw std::logic_error(
             this->identifier + ": Pl_Flate: write() called after finish() called");
     }
@@ -184,7 +184,7 @@ Pl_Flate::handleData(unsigned char const* data, size_t len, int flush)
             // this error (including at least one in qpdf's test suite). In some cases, we want to
             // know about this, because it indicates incorrect compression, so call a callback if
             // provided.
-            this->warn("input stream is complete but output may still be valid", err);
+            warn("input stream is complete but output may still be valid", err);
             done = true;
             break;
 
@@ -215,7 +215,7 @@ Pl_Flate::handleData(unsigned char const* data, size_t len, int flush)
             break;
 
         default:
-            this->checkError("data", err);
+            checkError("data", err);
             break;
         }
     }
@@ -271,7 +271,7 @@ Pl_Flate::checkError(char const* prefix, int error_code)
     z_stream& zstream = *(static_cast<z_stream*>(m->zdata));
     if (error_code != Z_OK) {
         char const* action_str = (m->action == a_deflate ? "deflate" : "inflate");
-        std::string msg = this->identifier + ": " + action_str + ": " + prefix + ": ";
+        std::string msg = identifier + ": " + action_str + ": " + prefix + ": ";
 
         if (zstream.msg) {
             msg += zstream.msg;
diff --git a/libqpdf/Pl_PNGFilter.cc b/libqpdf/Pl_PNGFilter.cc
index e3930e2..e3a3528 100644
--- a/libqpdf/Pl_PNGFilter.cc
+++ b/libqpdf/Pl_PNGFilter.cc
@@ -39,7 +39,7 @@ Pl_PNGFilter::Pl_PNGFilter(
         throw std::runtime_error(
             "PNGFilter created with invalid bits_per_sample not 1, 2, 4, 8, or 16");
     }
-    this->bytes_per_pixel = ((bits_per_sample * samples_per_pixel) + 7) / 8;
+    bytes_per_pixel = ((bits_per_sample * samples_per_pixel) + 7) / 8;
     unsigned long long bpr = ((columns * bits_per_sample * samples_per_pixel) + 7) / 8;
     if ((bpr == 0) || (bpr > (UINT_MAX - 1))) {
         throw std::runtime_error("PNGFilter created with invalid columns value");
@@ -47,16 +47,16 @@ Pl_PNGFilter::Pl_PNGFilter(
     if (memory_limit > 0 && bpr > (memory_limit / 2U)) {
         throw std::runtime_error("PNGFilter memory limit exceeded");
     }
-    this->bytes_per_row = bpr & UINT_MAX;
-    this->buf1 = QUtil::make_shared_array<unsigned char>(this->bytes_per_row + 1);
-    this->buf2 = QUtil::make_shared_array<unsigned char>(this->bytes_per_row + 1);
-    memset(this->buf1.get(), 0, this->bytes_per_row + 1);
-    memset(this->buf2.get(), 0, this->bytes_per_row + 1);
-    this->cur_row = this->buf1.get();
-    this->prev_row = this->buf2.get();
+    bytes_per_row = bpr & UINT_MAX;
+    buf1 = QUtil::make_shared_array<unsigned char>(bytes_per_row + 1);
+    buf2 = QUtil::make_shared_array<unsigned char>(bytes_per_row + 1);
+    memset(buf1.get(), 0, bytes_per_row + 1);
+    memset(buf2.get(), 0, bytes_per_row + 1);
+    cur_row = buf1.get();
+    prev_row = buf2.get();
 
     // number of bytes per incoming row
-    this->incoming = (action == a_encode ? this->bytes_per_row : this->bytes_per_row + 1);
+    incoming = (action == a_encode ? bytes_per_row : bytes_per_row + 1);
 }
 
 void
@@ -68,34 +68,34 @@ Pl_PNGFilter::setMemoryLimit(unsigned long long limit)
 void
 Pl_PNGFilter::write(unsigned char const* data, size_t len)
 {
-    size_t left = this->incoming - this->pos;
+    size_t left = incoming - pos;
     size_t offset = 0;
     while (len >= left) {
         // finish off current row
-        memcpy(this->cur_row + this->pos, data + offset, left);
+        memcpy(cur_row + pos, data + offset, left);
         offset += left;
         len -= left;
 
         processRow();
 
         // Swap rows
-        unsigned char* t = this->prev_row;
-        this->prev_row = this->cur_row;
-        this->cur_row = t ? t : this->buf2.get();
-        memset(this->cur_row, 0, this->bytes_per_row + 1);
-        left = this->incoming;
-        this->pos = 0;
+        unsigned char* t = prev_row;
+        prev_row = cur_row;
+        cur_row = t ? t : buf2.get();
+        memset(cur_row, 0, bytes_per_row + 1);
+        left = incoming;
+        pos = 0;
     }
     if (len) {
-        memcpy(this->cur_row + this->pos, data + offset, len);
+        memcpy(cur_row + pos, data + offset, len);
     }
-    this->pos += len;
+    pos += len;
 }
 
 void
 Pl_PNGFilter::processRow()
 {
-    if (this->action == a_encode) {
+    if (action == a_encode) {
         encodeRow();
     } else {
         decodeRow();
@@ -105,22 +105,22 @@ Pl_PNGFilter::processRow()
 void
 Pl_PNGFilter::decodeRow()
 {
-    int filter = this->cur_row[0];
-    if (this->prev_row) {
+    int filter = cur_row[0];
+    if (prev_row) {
         switch (filter) {
         case 0:
             break;
         case 1:
-            this->decodeSub();
+            decodeSub();
             break;
         case 2:
-            this->decodeUp();
+            decodeUp();
             break;
         case 3:
-            this->decodeAverage();
+            decodeAverage();
             break;
         case 4:
-            this->decodePaeth();
+            decodePaeth();
             break;
         default:
             // ignore
@@ -128,17 +128,17 @@ Pl_PNGFilter::decodeRow()
         }
     }
 
-    next()->write(this->cur_row + 1, this->bytes_per_row);
+    next()->write(cur_row + 1, bytes_per_row);
 }
 
 void
 Pl_PNGFilter::decodeSub()
 {
     QTC::TC("libtests", "Pl_PNGFilter decodeSub");
-    unsigned char* buffer = this->cur_row + 1;
-    unsigned int bpp = this->bytes_per_pixel;
+    unsigned char* buffer = cur_row + 1;
+    unsigned int bpp = bytes_per_pixel;
 
-    for (unsigned int i = 0; i < this->bytes_per_row; ++i) {
+    for (unsigned int i = 0; i < bytes_per_row; ++i) {
         unsigned char left = 0;
 
         if (i >= bpp) {
@@ -153,10 +153,10 @@ void
 Pl_PNGFilter::decodeUp()
 {
     QTC::TC("libtests", "Pl_PNGFilter decodeUp");
-    unsigned char* buffer = this->cur_row + 1;
-    unsigned char* above_buffer = this->prev_row + 1;
+    unsigned char* buffer = cur_row + 1;
+    unsigned char* above_buffer = prev_row + 1;
 
-    for (unsigned int i = 0; i < this->bytes_per_row; ++i) {
+    for (unsigned int i = 0; i < bytes_per_row; ++i) {
         unsigned char up = above_buffer[i];
         buffer[i] = static_cast<unsigned char>(buffer[i] + up);
     }
@@ -166,11 +166,11 @@ void
 Pl_PNGFilter::decodeAverage()
 {
     QTC::TC("libtests", "Pl_PNGFilter decodeAverage");
-    unsigned char* buffer = this->cur_row + 1;
-    unsigned char* above_buffer = this->prev_row + 1;
-    unsigned int bpp = this->bytes_per_pixel;
+    unsigned char* buffer = cur_row + 1;
+    unsigned char* above_buffer = prev_row + 1;
+    unsigned int bpp = bytes_per_pixel;
 
-    for (unsigned int i = 0; i < this->bytes_per_row; ++i) {
+    for (unsigned int i = 0; i < bytes_per_row; ++i) {
         int left = 0;
         int up = 0;
 
@@ -187,11 +187,11 @@ void
 Pl_PNGFilter::decodePaeth()
 {
     QTC::TC("libtests", "Pl_PNGFilter decodePaeth");
-    unsigned char* buffer = this->cur_row + 1;
-    unsigned char* above_buffer = this->prev_row + 1;
-    unsigned int bpp = this->bytes_per_pixel;
+    unsigned char* buffer = cur_row + 1;
+    unsigned char* above_buffer = prev_row + 1;
+    unsigned int bpp = bytes_per_pixel;
 
-    for (unsigned int i = 0; i < this->bytes_per_row; ++i) {
+    for (unsigned int i = 0; i < bytes_per_row; ++i) {
         int left = 0;
         int up = above_buffer[i];
         int upper_left = 0;
@@ -201,8 +201,7 @@ Pl_PNGFilter::decodePaeth()
             upper_left = above_buffer[i - bpp];
         }
 
-        buffer[i] =
-            static_cast<unsigned char>(buffer[i] + this->PaethPredictor(left, up, upper_left));
+        buffer[i] = static_cast<unsigned char>(buffer[i] + PaethPredictor(left, up, upper_left));
     }
 }
 
@@ -229,27 +228,27 @@ Pl_PNGFilter::encodeRow()
     // For now, hard-code to using UP filter.
     unsigned char ch = 2;
     next()->write(&ch, 1);
-    if (this->prev_row) {
-        for (unsigned int i = 0; i < this->bytes_per_row; ++i) {
-            ch = static_cast<unsigned char>(this->cur_row[i] - this->prev_row[i]);
+    if (prev_row) {
+        for (unsigned int i = 0; i < bytes_per_row; ++i) {
+            ch = static_cast<unsigned char>(cur_row[i] - prev_row[i]);
             next()->write(&ch, 1);
         }
     } else {
-        next()->write(this->cur_row, this->bytes_per_row);
+        next()->write(cur_row, bytes_per_row);
     }
 }
 
 void
 Pl_PNGFilter::finish()
 {
-    if (this->pos) {
+    if (pos) {
         // write partial row
         processRow();
     }
-    this->prev_row = nullptr;
-    this->cur_row = buf1.get();
-    this->pos = 0;
-    memset(this->cur_row, 0, this->bytes_per_row + 1);
+    prev_row = nullptr;
+    cur_row = buf1.get();
+    pos = 0;
+    memset(cur_row, 0, bytes_per_row + 1);
 
     next()->finish();
 }
diff --git a/libqpdf/QPDFJob_argv.cc b/libqpdf/QPDFJob_argv.cc
index 180a7a6..f49b7b5 100644
--- a/libqpdf/QPDFJob_argv.cc
+++ b/libqpdf/QPDFJob_argv.cc
@@ -58,25 +58,25 @@ void
 ArgParser::initOptionTables()
 {
 #include <qpdf/auto_job_init.hh>
-    this->ap.addFinalCheck([this]() { c_main->checkConfiguration(); });
+    ap.addFinalCheck([this]() { c_main->checkConfiguration(); });
     // add_help is defined in auto_job_help.hh
-    add_help(this->ap);
+    add_help(ap);
     // Special case: ignore -- at the top level. This undocumented behavior is for backward
     // compatibility; it was unintentionally the case prior to 10.6, and some users were relying on
     // it.
-    this->ap.selectMainOptionTable();
-    this->ap.addBare("--", []() {});
+    ap.selectMainOptionTable();
+    ap.addBare("--", []() {});
 }
 
 void
 ArgParser::argPositional(std::string const& arg)
 {
-    if (!this->gave_input) {
+    if (!gave_input) {
         c_main->inputFile(arg);
-        this->gave_input = true;
-    } else if (!this->gave_output) {
+        gave_input = true;
+    } else if (!gave_output) {
         c_main->outputFile(arg);
-        this->gave_output = true;
+        gave_output = true;
     } else {
         usage("unknown argument " + arg);
     }
@@ -86,20 +86,20 @@ void
 ArgParser::argEmpty()
 {
     c_main->emptyInput();
-    this->gave_input = true;
+    gave_input = true;
 }
 
 void
 ArgParser::argReplaceInput()
 {
     c_main->replaceInput();
-    this->gave_output = true;
+    gave_output = true;
 }
 
 void
 ArgParser::argVersion()
 {
-    auto whoami = this->ap.getProgname();
+    auto whoami = ap.getProgname();
     *QPDFLogger::defaultLogger()->getInfo()
         << whoami << " version " << QPDF::QPDFVersion() << "\n"
         << "Run " << whoami << " --copyright to see copyright and license information.\n";
@@ -136,7 +136,7 @@ ArgParser::argCopyright()
     //               1         2         3         4         5         6         7         8
     //      12345678901234567890123456789012345678901234567890123456789012345678901234567890
     *QPDFLogger::defaultLogger()->getInfo()
-        << this->ap.getProgname()
+        << ap.getProgname()
         << " version " << QPDF::QPDFVersion() << "\n"
         << "\n"
         << "Copyright (c) 2005-2021 Jay Berkenbilt\n"
@@ -190,9 +190,9 @@ ArgParser::argShowCrypto()
 void
 ArgParser::argEncrypt()
 {
-    this->c_enc = c_main->encrypt(0, "", "");
-    this->accumulated_args.clear();
-    this->ap.selectOptionTable(O_ENCRYPTION);
+    c_enc = c_main->encrypt(0, "", "");
+    accumulated_args.clear();
+    ap.selectOptionTable(O_ENCRYPTION);
 }
 
 void
@@ -202,14 +202,14 @@ ArgParser::argEncPositional(std::string const& arg)
         usage("positional and dashed encryption arguments may not be mixed");
     }
 
-    this->accumulated_args.push_back(arg);
-    if (this->accumulated_args.size() < 3) {
+    accumulated_args.push_back(arg);
+    if (accumulated_args.size() < 3) {
         return;
     }
-    user_password = this->accumulated_args.at(0);
-    owner_password = this->accumulated_args.at(1);
-    auto len_str = this->accumulated_args.at(2);
-    this->accumulated_args.clear();
+    user_password = accumulated_args.at(0);
+    owner_password = accumulated_args.at(1);
+    auto len_str = accumulated_args.at(2);
+    accumulated_args.clear();
     argEncBits(len_str);
 }
 
@@ -219,8 +219,8 @@ ArgParser::argEncUserPassword(std::string const& arg)
     if (!accumulated_args.empty()) {
         usage("positional and dashed encryption arguments may not be mixed");
     }
-    this->used_enc_password_args = true;
-    this->user_password = arg;
+    used_enc_password_args = true;
+    user_password = arg;
 }
 
 void
@@ -229,8 +229,8 @@ ArgParser::argEncOwnerPassword(std::string const& arg)
     if (!accumulated_args.empty()) {
         usage("positional and dashed encryption arguments may not be mixed");
     }
-    this->used_enc_password_args = true;
-    this->owner_password = arg;
+    used_enc_password_args = true;
+    owner_password = arg;
 }
 
 void
@@ -242,25 +242,25 @@ ArgParser::argEncBits(std::string const& arg)
     int keylen = 0;
     if (arg == "40") {
         keylen = 40;
-        this->ap.selectOptionTable(O_40_BIT_ENCRYPTION);
+        ap.selectOptionTable(O_40_BIT_ENCRYPTION);
     } else if (arg == "128") {
         keylen = 128;
-        this->ap.selectOptionTable(O_128_BIT_ENCRYPTION);
+        ap.selectOptionTable(O_128_BIT_ENCRYPTION);
     } else if (arg == "256") {
         keylen = 256;
-        this->ap.selectOptionTable(O_256_BIT_ENCRYPTION);
+        ap.selectOptionTable(O_256_BIT_ENCRYPTION);
     } else {
         usage("encryption key length must be 40, 128, or 256");
     }
-    this->c_enc = c_main->encrypt(keylen, user_password, owner_password);
+    c_enc = c_main->encrypt(keylen, user_password, owner_password);
 }
 
 void
 ArgParser::argPages()
 {
-    this->accumulated_args.clear();
-    this->c_pages = c_main->pages();
-    this->ap.selectOptionTable(O_PAGES);
+    accumulated_args.clear();
+    c_pages = c_main->pages();
+    ap.selectOptionTable(O_PAGES);
 }
 
 void
@@ -308,29 +308,29 @@ ArgParser::argEndPages()
 void
 ArgParser::argUnderlay()
 {
-    this->c_uo = c_main->underlay();
-    this->ap.selectOptionTable(O_UNDERLAY_OVERLAY);
+    c_uo = c_main->underlay();
+    ap.selectOptionTable(O_UNDERLAY_OVERLAY);
 }
 
 void
 ArgParser::argOverlay()
 {
-    this->c_uo = c_main->overlay();
-    this->ap.selectOptionTable(O_UNDERLAY_OVERLAY);
+    c_uo = c_main->overlay();
+    ap.selectOptionTable(O_UNDERLAY_OVERLAY);
 }
 
 void
 ArgParser::argAddAttachment()
 {
-    this->c_att = c_main->addAttachment();
-    this->ap.selectOptionTable(O_ATTACHMENT);
+    c_att = c_main->addAttachment();
+    ap.selectOptionTable(O_ATTACHMENT);
 }
 
 void
 ArgParser::argCopyAttachmentsFrom()
 {
-    this->c_copy_att = c_main->copyAttachmentsFrom();
-    this->ap.selectOptionTable(O_COPY_ATTACHMENT);
+    c_copy_att = c_main->copyAttachmentsFrom();
+    ap.selectOptionTable(O_COPY_ATTACHMENT);
 }
 
 void
@@ -400,7 +400,7 @@ ArgParser::argEndCopyAttachment()
 void
 ArgParser::argSetPageLabels()
 {
-    this->ap.selectOptionTable(O_SET_PAGE_LABELS);
+    ap.selectOptionTable(O_SET_PAGE_LABELS);
     accumulated_args.clear();
 }
 
@@ -427,14 +427,14 @@ ArgParser::argJobJsonHelp()
 void
 ArgParser::usage(std::string const& message)
 {
-    this->ap.usage(message);
+    ap.usage(message);
 }
 
 void
 ArgParser::parseOptions()
 {
     try {
-        this->ap.parseArgs();
+        ap.parseArgs();
     } catch (std::runtime_error& e) {
         usage(e.what());
     }
diff --git a/libqpdf/QPDFJob_config.cc b/libqpdf/QPDFJob_config.cc
index f4f2f36..f94d52d 100644
--- a/libqpdf/QPDFJob_config.cc
+++ b/libqpdf/QPDFJob_config.cc
@@ -701,7 +701,7 @@ QPDFJob::Config::passwordFile(std::string const& parameter)
 
         if (lines.size() > 1) {
             *QPDFLogger::defaultLogger()->getError()
-                << this->o.m->message_prefix << ": WARNING: all but the first line of"
+                << o.m->message_prefix << ": WARNING: all but the first line of"
                 << " the password file are ignored\n";
         }
     }
@@ -806,7 +806,7 @@ QPDFJob::Config::jobJsonFile(std::string const& parameter)
     } catch (std::exception& e) {
         throw std::runtime_error(
             "error with job-json file " + std::string(parameter) + ": " + e.what() + "\nRun " +
-            this->o.m->message_prefix + " --job-json-help for information on the file format.");
+            o.m->message_prefix + " --job-json-help for information on the file format.");
     }
     return this;
 }
@@ -832,32 +832,32 @@ QPDFJob::CopyAttConfig::CopyAttConfig(Config* c) :
 QPDFJob::CopyAttConfig*
 QPDFJob::CopyAttConfig::file(std::string const& parameter)
 {
-    this->caf.path = parameter;
+    caf.path = parameter;
     return this;
 }
 
 QPDFJob::CopyAttConfig*
 QPDFJob::CopyAttConfig::prefix(std::string const& parameter)
 {
-    this->caf.prefix = parameter;
+    caf.prefix = parameter;
     return this;
 }
 
 QPDFJob::CopyAttConfig*
 QPDFJob::CopyAttConfig::password(std::string const& parameter)
 {
-    this->caf.password = parameter;
+    caf.password = parameter;
     return this;
 }
 
 QPDFJob::Config*
 QPDFJob::CopyAttConfig::endCopyAttachmentsFrom()
 {
-    if (this->caf.path.empty()) {
+    if (caf.path.empty()) {
         usage("copy attachments: no file specified");
     }
-    this->config->o.m->attachments_to_copy.push_back(this->caf);
-    return this->config;
+    config->o.m->attachments_to_copy.push_back(caf);
+    return config;
 }
 
 QPDFJob::AttConfig::AttConfig(Config* c) :
@@ -874,21 +874,21 @@ QPDFJob::Config::addAttachment()
 QPDFJob::AttConfig*
 QPDFJob::AttConfig::file(std::string const& parameter)
 {
-    this->att.path = parameter;
+    att.path = parameter;
     return this;
 }
 
 QPDFJob::AttConfig*
 QPDFJob::AttConfig::key(std::string const& parameter)
 {
-    this->att.key = parameter;
+    att.key = parameter;
     return this;
 }
 
 QPDFJob::AttConfig*
 QPDFJob::AttConfig::filename(std::string const& parameter)
 {
-    this->att.filename = parameter;
+    att.filename = parameter;
     return this;
 }
 
@@ -898,7 +898,7 @@ QPDFJob::AttConfig::creationdate(std::string const& parameter)
     if (!QUtil::pdf_time_to_qpdf_time(parameter)) {
         usage(std::string(parameter) + " is not a valid PDF timestamp");
     }
-    this->att.creationdate = parameter;
+    att.creationdate = parameter;
     return this;
 }
 
@@ -908,7 +908,7 @@ QPDFJob::AttConfig::moddate(std::string const& parameter)
     if (!QUtil::pdf_time_to_qpdf_time(parameter)) {
         usage(std::string(parameter) + " is not a valid PDF timestamp");
     }
-    this->att.moddate = parameter;
+    att.moddate = parameter;
     return this;
 }
 
@@ -918,21 +918,21 @@ QPDFJob::AttConfig::mimetype(std::string const& parameter)
     if (parameter.find('/') == std::string::npos) {
         usage("mime type should be specified as type/subtype");
     }
-    this->att.mimetype = parameter;
+    att.mimetype = parameter;
     return this;
 }
 
 QPDFJob::AttConfig*
 QPDFJob::AttConfig::description(std::string const& parameter)
 {
-    this->att.description = parameter;
+    att.description = parameter;
     return this;
 }
 
 QPDFJob::AttConfig*
 QPDFJob::AttConfig::replace()
 {
-    this->att.replace = true;
+    att.replace = true;
     return this;
 }
 
@@ -940,28 +940,28 @@ QPDFJob::Config*
 QPDFJob::AttConfig::endAddAttachment()
 {
     static std::string now = QUtil::qpdf_time_to_pdf_time(QUtil::get_current_qpdf_time());
-    if (this->att.path.empty()) {
+    if (att.path.empty()) {
         usage("add attachment: no file specified");
     }
-    std::string last_element = QUtil::path_basename(this->att.path);
+    std::string last_element = QUtil::path_basename(att.path);
     if (last_element.empty()) {
         usage("file for --add-attachment may not be empty");
     }
-    if (this->att.filename.empty()) {
-        this->att.filename = last_element;
+    if (att.filename.empty()) {
+        att.filename = last_element;
     }
-    if (this->att.key.empty()) {
-        this->att.key = last_element;
+    if (att.key.empty()) {
+        att.key = last_element;
     }
-    if (this->att.creationdate.empty()) {
-        this->att.creationdate = now;
+    if (att.creationdate.empty()) {
+        att.creationdate = now;
     }
-    if (this->att.moddate.empty()) {
-        this->att.moddate = now;
+    if (att.moddate.empty()) {
+        att.moddate = now;
     }
 
-    this->config->o.m->attachments_to_add.push_back(this->att);
-    return this->config;
+    config->o.m->attachments_to_add.push_back(att);
+    return config;
 }
 
 QPDFJob::PagesConfig::PagesConfig(Config* c) :
@@ -985,21 +985,21 @@ QPDFJob::PagesConfig::endPages()
     if (n_specs == 0) {
         usage("--pages: no page specifications given");
     }
-    return this->config;
+    return config;
 }
 
 QPDFJob::PagesConfig*
 QPDFJob::PagesConfig::pageSpec(
     std::string const& filename, std::string const& range, char const* password)
 {
-    this->config->o.m->page_specs.emplace_back(filename, password, range);
+    config->o.m->page_specs.emplace_back(filename, password, range);
     return this;
 }
 
 QPDFJob::PagesConfig*
 QPDFJob::PagesConfig::file(std::string const& arg)
 {
-    this->config->o.m->page_specs.emplace_back(arg, "", "");
+    config->o.m->page_specs.emplace_back(arg, "", "");
     return this;
 }
 
@@ -1063,7 +1063,7 @@ QPDFJob::UOConfig::endUnderlayOverlay()
         usage(config->o.m->under_overlay->which + " file not specified");
     }
     config->o.m->under_overlay = nullptr;
-    return this->config;
+    return config;
 }
 
 QPDFJob::UOConfig*
@@ -1192,7 +1192,7 @@ QPDFJob::EncConfig::endEncrypt()
     config->o.m->encrypt = true;
     config->o.m->decrypt = false;
     config->o.m->copy_encryption = false;
-    return this->config;
+    return config;
 }
 
 QPDFJob::EncConfig*
@@ -1341,5 +1341,5 @@ QPDFJob::PageLabelsConfig::PageLabelsConfig(Config* c) :
 QPDFJob::Config*
 QPDFJob::PageLabelsConfig::endSetPageLabels()
 {
-    return this->config;
+    return config;
 }