[PyQt] [PATCH v2 1/6] Add SIP_NULLPTR/SIP_OVERRIDE compatibility macros

[Stefan Brüns]

To allow using nullptr throughout the generated code while staying
backwards compatible for C and older C++ compilers, use SIP_NULLPTR
as a proxy. Likewise for override/SIP_OVERRIDE.

Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
---
 sipgen/gencode.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/sipgen/gencode.c b/sipgen/gencode.c
index ca76761..98a84b5 100644
--- a/sipgen/gencode.c
+++ b/sipgen/gencode.c
@@ -301,6 +301,7 @@ static void generatePreprocLine(int linenr, const char *fname, FILE *fp);
 static int hasOptionalArgs(overDef *od);
 static int emptyIfaceFile(sipSpec *pt, ifaceFileDef *iff);
 static void declareLimitedAPI(int py_debug, moduleDef *mod, FILE *fp);
+static void declareCompatDefines(FILE *fp);
 static int generatePluginSignalsTable(sipSpec *pt, classDef *cd,
         const char *pyqt_prefix, FILE *fp);
 static int generatePyQt5ClassPlugin(sipSpec *pt, classDef *cd, FILE *fp);
@@ -608,6 +609,9 @@ static void generateInternalAPIHeader(sipSpec *pt, moduleDef *mod,
 "#include <QThread>\n"
             );
 
+    /* Define macros for forward/backwards compatibility */
+    declareCompatDefines(fp);
+
     /* Define the qualifiers. */
     noIntro = TRUE;
 
@@ -1165,6 +1169,9 @@ static void generateCompositeCpp(sipSpec *pt, const char *codeDir,
 "}\n"
         );
 
+    /* Define macros for forward/backwards compatibility */
+    declareCompatDefines(fp);
+
     generateModDocstring(pt->module, fp);
     generateModInitStart(pt->module, TRUE, fp);
     generateModDefinition(pt->module, "NULL", fp);
@@ -15473,6 +15480,31 @@ static void declareLimitedAPI(int py_debug, moduleDef *mod, FILE *fp)
 }
 
 
+/*
+ *
+ * Add some convenience macros to make code forward/backwards compatible.
+ */
+static void declareCompatDefines(FILE *fp)
+{
+    prcode(fp,
+"\n"
+"#ifndef SIP_NULLPTR\n"
+"#if __cplusplus >= 201103L\n"
+"#define SIP_NULLPTR nullptr\n"
+"#define SIP_OVERRIDE override\n"
+"#elif defined _MSVC_LANG\n"
+"#define SIP_NULLPTR nullptr\n"
+"#define SIP_OVERRIDE override\n"
+"#else\n"
+"#define SIP_NULLPTR 0\n"
+"#define SIP_OVERRIDE\n"
+"#endif\n"
+"#endif\n"
+"\n"
+          );
+}
+
+
 /*
  * Generate the PyQt4/5 signals table.
  */
-- 
2.19.0