Upgrading to C++20

.github/workflows/ci_build.yml

@@ -6,7 +6,7 @@ on:
     # but only for the branches specified
     branches:
       # Push events on develop branch
-      - develop
+      - 'develop'
       # Push events on ci-test branch (uncomment if needed for testing purposes)
       # - ci-test
     paths-ignore:
@@ -44,7 +44,7 @@ env:
   # emscripten
   EM_VERSION: latest
   EM_CACHE_FOLDER: "emsdk-cache"
-  EM_CACHE_ID: 2
+  EM_CACHE_ID: 3
 
   # gh-pages
   GH_PAGES_REPO: ${{ github.repository_owner }}/verovio.org # works from rism-digital and from forks
@@ -74,10 +74,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
-            compiler: g++
-            version: "9"
-
           - os: ubuntu-20.04
             compiler: g++
             version: "10"
@@ -86,13 +82,17 @@ jobs:
             compiler: g++
             version: "11"
 
+          - os: ubuntu-22.04
+            compiler: g++
+            version: "12"
+
           - os: ubuntu-20.04
             compiler: clang
-            version: "6.0"
+            version: "10"
 
           - os: ubuntu-20.04
             compiler: clang
-            version: "9"
+            version: "11"
 
           - os: ubuntu-20.04
             compiler: clang

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## [unreleased]
 * Support for `fTrem@unitdur` (@eNote-GmbH)
+* Upgrade to C++20
 
 ## [4.1.0] - 2023-12-15
 * Support for staves ordered by `scoreDef`

README.md

@@ -9,7 +9,7 @@
 
 Verovio is a fast, portable and lightweight library for engraving [Music Encoding Initiative (MEI)](http://www.music-encoding.org) digital scores into SVG images. Verovio also contains on-the-fly converters to render [Plaine & Easie Code](https://www.iaml.info/plaine-easie-code), [Humdrum](https://www.humdrum.org), [Musedata](https://musedata.org), [MusicXML](https://www.musicxml.com), [EsAC](http://esac-data.org), and [ABC](https://en.wikipedia.org/wiki/ABC_notation) digital scores. 
 
-Verovio is written in standard 2017 C++ and can be compiled as a standalone command-line tool, used as a compiled music-rendering library for applications (Qt, python), or compiled into Javascript using the Emscripten LLVM-to-JavaScript compiler.  Check out the JavaScript toolkit version of verovio running in the [MEI Viewer](http://www.verovio.org/mei-viewer.xhtml) as well as the [app](http://www.verovio.org/app.html) or [tutorials](https://book.verovio.org/first-steps/) for web integration and user interaction.
+Verovio is written in standard 2020 C++ and can be compiled as a standalone command-line tool, used as a compiled music-rendering library for applications (Qt, python), or compiled into Javascript using the Emscripten LLVM-to-JavaScript compiler.  Check out the JavaScript toolkit version of verovio running in the [MEI Viewer](http://www.verovio.org/mei-viewer.xhtml) as well as the [app](http://www.verovio.org/app.html) or [tutorials](https://book.verovio.org/first-steps/) for web integration and user interaction.
 
 ![Choice interaction](https://raw.githubusercontent.com/rism-digital/verovio.org/gh-pages/movies/reflow.gif)
 

Verovio.xcodeproj/project.pbxproj

@@ -5024,7 +5024,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_CXX_LANGUAGE_STANDARD = "c++17";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++20";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
@@ -5083,7 +5083,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
-				CLANG_CXX_LANGUAGE_STANDARD = "c++17";
+				CLANG_CXX_LANGUAGE_STANDARD = "c++20";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_OBJC_ARC = YES;
 				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;

cmake/CMakeLists.txt

@@ -48,7 +48,7 @@ if(MSVC)
     add_definitions(/wd4244)          # suppress warning of possible loss of precision
     add_definitions(-DNO_PAE_SUPPORT) # regex is working differently under Windows so PAE is not supported (yet)
     add_definitions(-DUSE_PAE_OLD_PARSER)
-    add_definitions(/std:c++17)
+    add_definitions(/std:c++20)
     include_directories(../include/win32)
 else()
     if(CMAKE_BUILD_TYPE MATCHES Debug)
@@ -60,7 +60,7 @@ else()
     # jsonxx raises -Wdollar-in-identifier-extension
     # gcc 8.3.1 does not like -Wdollar-in-identifier-extension option.
     add_definitions(-Wall -W -pedantic -Wno-unused-parameter -Wno-dollar-in-identifier-extension)
-    add_definitions(-std=c++17)
+    add_definitions(-std=c++20)
 
     # extra warnings similar to Xcode compiling settings (most probably covered by -Wall):
     # https://github.com/llvm-mirror/clang/blob/master/include/clang/Basic/DiagnosticGroups.td

emscripten/buildToolkit

@@ -55,7 +55,7 @@ my ($lightQ, $version, $chattyQ, $helpQ, $exclusion, $wasmQ, $makeQ, $modularize
 my ($nopae, $nohumdrum, $nomusicxml, $nodarms);
 my ($FLAGS_NAME, $VERSION, $CHATTY);
 
-my $cpp = 17;             # c++ version to compile (11, 14, 17)
+my $cpp = 20;             # c++ version to compile (11, 14, 17)
 my $VEROVIO_ROOT  = "..";
 
 Getopt::Long::Configure("bundling");

include/vrv/staff.h

@@ -23,6 +23,49 @@ class Syl;
 class TimeSpanningInterface;
 class Tuning;
 
+//----------------------------------------------------------------------------
+// LedgerLine
+//----------------------------------------------------------------------------
+
+/**
+ * This is a class with no MEI equivalent for representing legder lines.
+ * A ledger line is represented by a list of dashes.
+ * Each dash is represented by a pair of points (left - right).
+ */
+class LedgerLine {
+public:
+    /**
+     * @name Constructors, destructors, reset methods
+     * Reset method reset all attribute classes
+     */
+    ///@{
+    LedgerLine();
+    virtual ~LedgerLine();
+    virtual void Reset();
+    ///@}
+
+    /**
+     * Add a dash to the ledger line object.
+     * If necessary merges overlapping dashes.
+     */
+    void AddDash(int left, int right, int extension);
+
+protected:
+    //
+private:
+    //
+public:
+    /**
+     * A list of dashes relative to the staff position.
+     */
+    std::list<std::pair<int, int>> m_dashes;
+
+protected:
+    //
+private:
+    //
+};
+
 //----------------------------------------------------------------------------
 // Staff
 //----------------------------------------------------------------------------
@@ -249,49 +292,6 @@ class Staff : public Object,
     ///@}
 };
 
-//----------------------------------------------------------------------------
-// LedgerLine
-//----------------------------------------------------------------------------
-
-/**
- * This is a class with no MEI equivalent for representing legder lines.
- * A ledger line is represented by a list of dashes.
- * Each dash is represented by a pair of points (left - right).
- */
-class LedgerLine {
-public:
-    /**
-     * @name Constructors, destructors, reset methods
-     * Reset method reset all attribute classes
-     */
-    ///@{
-    LedgerLine();
-    virtual ~LedgerLine();
-    virtual void Reset();
-    ///@}
-
-    /**
-     * Add a dash to the ledger line object.
-     * If necessary merges overlapping dashes.
-     */
-    void AddDash(int left, int right, int extension);
-
-protected:
-    //
-private:
-    //
-public:
-    /**
-     * A list of dashes relative to the staff position.
-     */
-    std::list<std::pair<int, int>> m_dashes;
-
-protected:
-    //
-private:
-    //
-};
-
 } // namespace vrv
 
 #endif

include/win32/win_getopt.h

@@ -36,7 +36,7 @@ int	optopt = '?';		/* character checked for validity */
 #undef	optreset		/* see getopt.h */
 #define	optreset		__mingw_optreset
 int	optreset;		/* reset getopt */
-char    *optarg;		/* argument associated with option */
+const char *optarg;		/* argument associated with option */
 #endif
 
 //extern int optind;		/* index of first non-option in argv      */
@@ -76,7 +76,7 @@ static int parse_long_options(char * const *, const char *,
 static int gcd(int, int);
 static void permute_args(int, int, int, char * const *);
 
-static char *place = EMSG; /* option letter processing */
+static const char *place = EMSG; /* option letter processing */
 
 /* XXX: set optreset to 1 rather than these two */
 static int nonopt_start = -1; /* first non option argument (for permute) */
@@ -243,7 +243,7 @@ static int
 parse_long_options(char * const *nargv, const char *options,
 	const struct option *long_options, int *idx, int short_too)
 {
-	char *current_argv, *has_equal;
+    const char *current_argv, *has_equal;
 	size_t current_argv_len;
 	int i, ambiguous, match;
 

setup.py

@@ -83,10 +83,10 @@ def get_version() -> str:
 # extra compile arguments
 EXTRA_COMPILE_ARGS = ['-DPYTHON_BINDING']
 if platform.system() != 'Windows':
-    EXTRA_COMPILE_ARGS += ['-std=c++17',
+    EXTRA_COMPILE_ARGS += ['-std=c++20',
                            '-Wno-write-strings', '-Wno-overloaded-virtual', '-g0']
 else:
-    EXTRA_COMPILE_ARGS += ['/std:c++17',
+    EXTRA_COMPILE_ARGS += ['/std:c++20',
                            '-DNO_PAE_SUPPORT']
 
 verovio_module = Extension('verovio._verovio',

src/accid.cpp

@@ -162,7 +162,7 @@ void Accid::AdjustX(LayerElement *element, const Doc *doc, int staffSize, std::v
             leftAccids.push_back(accid);
             return;
         }
-        if (adjustedAccids.count(accid) == 0) return;
+        if (!adjustedAccids.contains(accid)) return;
     }
 
     int xRelShift = 0;

src/measure.cpp

@@ -496,8 +496,9 @@ const Staff *Measure::GetBottomVisibleStaff() const
 int Measure::EnclosesTime(int time) const
 {
     int repeat = 1;
-    double timeDuration
-        = m_measureAligner.GetRightAlignment()->GetTime() * DURATION_4 / DUR_MAX * 60.0 / m_currentTempo * 1000.0 + 0.5;
+    double timeDuration = m_measureAligner.GetRightAlignment()->GetTime() * static_cast<int>(DURATION_4) / DUR_MAX
+            * 60.0 / m_currentTempo * 1000.0
+        + 0.5;
     std::vector<double>::const_iterator iter;
     for (iter = m_realTimeOffsetMilliseconds.begin(); iter != m_realTimeOffsetMilliseconds.end(); ++iter) {
         if ((time >= *iter) && (time <= *iter + timeDuration)) return repeat;

src/midifunctor.cpp

@@ -239,8 +239,8 @@ FunctorCode InitMaxMeasureDurationFunctor::VisitMeasureEnd(Measure *measure)
     const double tempo = this->GetAdjustedTempo();
     measure->SetCurrentTempo(tempo);
 
-    const double scoreTimeIncrement
-        = measure->m_measureAligner.GetRightAlignment()->GetTime() * m_multiRestFactor * DURATION_4 / DUR_MAX;
+    const double scoreTimeIncrement = measure->m_measureAligner.GetRightAlignment()->GetTime() * m_multiRestFactor
+        * static_cast<int>(DURATION_4) / DUR_MAX;
     m_currentScoreTime += scoreTimeIncrement;
     m_currentRealTimeSeconds += scoreTimeIncrement * 60.0 / tempo;
     m_multiRestFactor = 1;
@@ -698,7 +698,7 @@ FunctorCode GenerateMIDIFunctor::VisitPedal(const Pedal *pedal)
 {
     if (!pedal->HasDir()) return FUNCTOR_CONTINUE;
 
-    double pedalTime = pedal->GetStart()->GetAlignment()->GetTime() * DURATION_4 / DUR_MAX;
+    double pedalTime = pedal->GetStart()->GetAlignment()->GetTime() * static_cast<int>(DURATION_4) / DUR_MAX;
     double startTime = m_totalTime + pedalTime;
     int tpq = m_midiFile->getTPQ();
 

src/view_neume.cpp

@@ -74,10 +74,10 @@ void View::DrawNc(DeviceContext *dc, LayerElement *element, Layer *layer, Staff
     struct drawingParams {
         wchar_t fontNo = SMUFL_E990_chantPunctum;
         wchar_t fontNoLiq[5] = {};
-        float xOffset = 0;
-        float yOffset = 0;
-        float xOffsetLiq[5] = { 0, 0, 0, 0, 0 };
-        float yOffsetLiq[5] = { 0, 0, 0, 0, 0 };
+        double xOffset = 0;
+        double yOffset = 0;
+        double xOffsetLiq[5] = { 0, 0, 0, 0, 0 };
+        double yOffsetLiq[5] = { 0, 0, 0, 0, 0 };
     };
     std::vector<drawingParams> params;
     params.push_back(drawingParams());