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genbindings/go: refactor to reuse template emitters
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@ -178,6 +178,8 @@ func (gfs *goFileState) emitParametersGo2CABIForwarding(m CppMethod) (preamble s
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// QApplication constructor. Convert 'args' into Qt's wanted types
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// Qt has a warning in the docs saying these pointers must be valid
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// for the entire lifetype of QApplication, so, malloc + never free
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// This transformation only affects the Go side. The CABI side is
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// projected naturally
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preamble += "// Convert []string to long-lived int& argc, char** argv, never call free()\n"
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preamble += "argc := (*C.int)(C.malloc(8))\n"
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@ -193,89 +195,84 @@ func (gfs *goFileState) emitParametersGo2CABIForwarding(m CppMethod) (preamble s
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// Skip this parameter, already handled
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skipNext = false
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} else if p.ParameterType == "QString" {
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// Go: convert string -> miqt_string*
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// CABI: convert miqt_string* -> real QString
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preamble += p.ParameterName + "_ms := miqt_strdupg(" + p.ParameterName + ")\n"
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preamble += "defer C.free(" + p.ParameterName + "_ms)\n"
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tmp = append(tmp, "(*C.struct_miqt_string)("+p.ParameterName+"_ms)")
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} else if listType, ok := p.QListOf(); ok {
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// QList<T>
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// Go: convert T[] -> t* and len
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// CABI: create a real QList<>
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gfs.imports["runtime"] = struct{}{}
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gfs.imports["unsafe"] = struct{}{}
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if listType.ParameterType == "QString" {
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// Combo
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preamble += "// For the C ABI, malloc two C arrays; raw char* pointers and their lengths\n"
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preamble += p.ParameterName + "_CArray := (*[0xffff]" + listType.parameterTypeCgo() + ")(C.malloc(C.size_t(8 * len(" + p.ParameterName + "))))\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_CArray))\n"
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preamble += "for i := range " + p.ParameterName + "{\n"
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preamble += "single_ms := miqt_strdupg(" + p.ParameterName + "[i])\n"
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preamble += "defer C.free(single_ms)\n"
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preamble += p.ParameterName + "_CArray[i] = (*C.struct_miqt_string)(single_ms)\n"
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preamble += "}\n"
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preamble += p.ParameterName + "_ma := &C.struct_miqt_array{len: C.size_t(len(" + p.ParameterName + ")), data: unsafe.Pointer(" + p.ParameterName + "_CArray)}\n"
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preamble += "defer runtime.KeepAlive(unsafe.Pointer(" + p.ParameterName + "_ma))\n"
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tmp = append(tmp, p.ParameterName+"_ma")
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} else {
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preamble += "// For the C ABI, malloc a C array of raw pointers\n"
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preamble += p.ParameterName + "_CArray := (*[0xffff]" + listType.parameterTypeCgo() + ")(C.malloc(C.size_t(8 * len(" + p.ParameterName + "))))\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_CArray))\n"
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preamble += "for i := range " + p.ParameterName + "{\n"
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if listType.QtClassType() {
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preamble += p.ParameterName + "_CArray[i] = " + p.ParameterName + "[i].cPointer()\n"
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} else {
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preamble += p.ParameterName + "_CArray[i] = (" + listType.parameterTypeCgo() + ")(" + p.ParameterName + "[i])\n"
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}
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preamble += "}\n"
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preamble += p.ParameterName + "_ma := &C.struct_miqt_array{len: C.size_t(len(" + p.ParameterName + ")), data: unsafe.Pointer(" + p.ParameterName + "_CArray)}\n"
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preamble += "defer runtime.KeepAlive(unsafe.Pointer(" + p.ParameterName + "_ma))\n"
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tmp = append(tmp, p.ParameterName+"_ma")
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}
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} else if p.Pointer && p.ParameterType == "char" {
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// Single char* argument
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gfs.imports["unsafe"] = struct{}{}
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preamble += p.ParameterName + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(unsafe.Pointer(" + p.ParameterName + "_Cstring))\n"
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tmp = append(tmp, p.ParameterName+"_Cstring")
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} else if /*(p.Pointer || p.ByRef) &&*/ p.QtClassType() {
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// The C++ type is a pointer to Qt class
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// We want our functions to accept the Go wrapper type, and forward as cPointer()
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tmp = append(tmp, p.ParameterName+".cPointer()")
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} else if p.IntType() || p.ParameterType == "bool" {
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if p.Pointer || p.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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tmp = append(tmp, "("+p.parameterTypeCgo()+")(unsafe.Pointer("+p.ParameterName+"))") // n.b. This may not work if the integer type conversion was wrong
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} else {
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tmp = append(tmp, "("+p.parameterTypeCgo()+")("+p.ParameterName+")")
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}
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} else {
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// Default
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tmp = append(tmp, p.ParameterName)
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addPreamble, rvalue := gfs.emitParameterGo2CABIForwarding(p)
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preamble += addPreamble
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tmp = append(tmp, rvalue)
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}
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}
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return preamble, strings.Join(tmp, ", ")
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}
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func (gfs *goFileState) emitParameterGo2CABIForwarding(p CppParameter) (preamble string, rvalue string) {
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nameprefix := strings.Replace(strings.Replace(p.ParameterName, `[`, `_`, -1), `]`, "", -1)
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if p.ParameterType == "QString" {
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// Go: convert string -> miqt_string*
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// CABI: convert miqt_string* -> real QString
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preamble += nameprefix + "_ms := miqt_strdupg(" + p.ParameterName + ")\n"
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preamble += "defer C.free(" + nameprefix + "_ms)\n"
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rvalue = "(*C.struct_miqt_string)(" + nameprefix + "_ms)"
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} else if listType, ok := p.QListOf(); ok {
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// QList<T>
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// Go: convert T[] -> t* and len
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// CABI: create a real QList<>
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gfs.imports["runtime"] = struct{}{}
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gfs.imports["unsafe"] = struct{}{}
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preamble += "// For the C ABI, malloc a C array of raw pointers\n"
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preamble += nameprefix + "_CArray := (*[0xffff]" + listType.parameterTypeCgo() + ")(C.malloc(C.size_t(8 * len(" + p.ParameterName + "))))\n"
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preamble += "defer C.free(unsafe.Pointer(" + nameprefix + "_CArray))\n"
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preamble += "for i := range " + p.ParameterName + "{\n"
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listType.ParameterName = p.ParameterName + "[i]"
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addPreamble, innerRvalue := gfs.emitParameterGo2CABIForwarding(listType)
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preamble += addPreamble
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preamble += nameprefix + "_CArray[i] = " + innerRvalue + "\n"
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preamble += "}\n"
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preamble += p.ParameterName + "_ma := &C.struct_miqt_array{len: C.size_t(len(" + p.ParameterName + ")), data: unsafe.Pointer(" + nameprefix + "_CArray)}\n"
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preamble += "defer runtime.KeepAlive(unsafe.Pointer(" + nameprefix + "_ma))\n"
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rvalue = p.ParameterName + "_ma"
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} else if p.Pointer && p.ParameterType == "char" {
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// Single char* argument
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gfs.imports["unsafe"] = struct{}{}
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preamble += nameprefix + "_Cstring := C.CString(" + p.ParameterName + ")\n"
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preamble += "defer C.free(unsafe.Pointer(" + nameprefix + "_Cstring))\n"
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rvalue = nameprefix + "_Cstring"
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} else if /*(p.Pointer || p.ByRef) &&*/ p.QtClassType() {
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// The C++ type is a pointer to Qt class
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// We want our functions to accept the Go wrapper type, and forward as cPointer()
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rvalue = p.ParameterName + ".cPointer()"
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} else if p.IntType() || p.ParameterType == "bool" {
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if p.Pointer || p.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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rvalue = "(" + p.parameterTypeCgo() + ")(unsafe.Pointer(" + p.ParameterName + "))" // n.b. This may not work if the integer type conversion was wrong
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} else {
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rvalue = "(" + p.parameterTypeCgo() + ")(" + p.ParameterName + ")"
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}
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} else {
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// Default
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rvalue = p.ParameterName
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}
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return preamble, rvalue
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}
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func (gfs *goFileState) emitCabiToGo(assignExpr string, rt CppParameter, rvalue string) string {
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shouldReturn := "return "
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@ -309,37 +306,16 @@ func (gfs *goFileState) emitCabiToGo(assignExpr string, rt CppParameter, rvalue
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gfs.imports["unsafe"] = struct{}{}
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shouldReturn = "var " + namePrefix + "_ma *C.struct_miqt_array = "
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if t.ParameterType == "QString" {
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// Combo
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afterword += namePrefix + "_ret := make([]string, int(" + namePrefix + "_ma.len))\n"
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afterword += "_outCast := (*[0xffff]*C.struct_miqt_string)(unsafe.Pointer(" + namePrefix + "_ma.data)) // hey ya\n"
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afterword += "for i := 0; i < int(" + namePrefix + "_ma.len); i++ {\n"
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afterword += namePrefix + "_ret[i] = C.GoStringN(&_outCast[i].data, C.int(int64(_outCast[i].len)))\n"
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afterword += "C.free(unsafe.Pointer(_outCast[i])) // free the inner miqt_string*\n"
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(" + namePrefix + "_ma))\n"
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afterword += assignExpr + " " + namePrefix + "_ret\n"
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afterword += namePrefix + "_ret := make([]" + t.RenderTypeGo() + ", int(" + namePrefix + "_ma.len))\n"
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afterword += namePrefix + "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(" + namePrefix + "_ma.data)) // hey ya\n"
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afterword += "for i := 0; i < int(" + namePrefix + "_ma.len); i++ {\n"
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} else {
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afterword += gfs.emitCabiToGo(namePrefix+"_ret[i] = ", t, namePrefix+"_outCast[i]")
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afterword += "" + namePrefix + "_ret := make([]" + t.RenderTypeGo() + ", int(" + namePrefix + "_ma.len))\n"
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afterword += "_outCast := (*[0xffff]" + t.parameterTypeCgo() + ")(unsafe.Pointer(" + namePrefix + "_ma.data)) // mrs jackson\n"
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afterword += "for i := 0; i < int(" + namePrefix + "_ma.len); i++ {\n"
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if t.QtClassType() {
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if !t.Pointer {
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// new, but then dereference it
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afterword += "" + namePrefix + "_ret[i] = *new" + cabiClassName(t.ParameterType) + "(_outCast[i])\n"
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} else {
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afterword += "" + namePrefix + "_ret[i] = new" + cabiClassName(t.ParameterType) + "(_outCast[i])\n"
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}
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} else { // plain int type
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afterword += "" + namePrefix + "_ret[i] = (" + t.RenderTypeGo() + ")(_outCast[i])\n"
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}
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(" + namePrefix + "_ma))\n"
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afterword += assignExpr + " " + namePrefix + "_ret\n"
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}
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afterword += "}\n"
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afterword += "C.free(unsafe.Pointer(" + namePrefix + "_ma))\n"
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afterword += assignExpr + " " + namePrefix + "_ret\n"
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} else if rt.QtClassType() {
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// Construct our Go type based on this inner CABI type
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@ -347,7 +323,7 @@ func (gfs *goFileState) emitCabiToGo(assignExpr string, rt CppParameter, rvalue
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if rt.Pointer || rt.ByRef {
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gfs.imports["unsafe"] = struct{}{}
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afterword = assignExpr + " new" + cabiClassName(rt.ParameterType) + "_U(unsafe.Pointer(" + namePrefix + "_ret))"
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return assignExpr + " new" + cabiClassName(rt.ParameterType) + "_U(unsafe.Pointer(" + rvalue + "))"
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} else {
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// This is return by value, but CABI has new'd it into a
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@ -371,8 +347,8 @@ func (gfs *goFileState) emitCabiToGo(assignExpr string, rt CppParameter, rvalue
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} else if rt.IntType() || rt.ParameterType == "bool" {
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// Need to cast Cgo type to Go int type
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shouldReturn = "" + namePrefix + "_ret := "
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afterword += assignExpr + "(" + rt.RenderTypeGo() + ")(" + namePrefix + "_ret)\n"
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// Optimize assignment to avoid temporary
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return assignExpr + "(" + rt.RenderTypeGo() + ")(" + rvalue + ")\n"
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}
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