From 2314c41103a789787eed18e46ca8df75c6ee02c6 Mon Sep 17 00:00:00 2001
From: xushiwei <x@goplus.org>
Date: Sun, 23 Jun 2024 16:12:01 +0800
Subject: [PATCH] cppmintf: implements multiple intefaces in c++

---
 _demo/cppmintf/cpp_multi_intf.go    |  50 ++++++++++++++++++++++++++++
 _demo/cppmintf/foo/bar/bar.cpp      |  17 ++++++++++
 _demo/cppmintf/foo/foo.go           |  42 +++++++++++++++++++++++
 _demo/cppmintf/foo/llgo_autogen.lla | Bin 0 -> 411 bytes
 4 files changed, 109 insertions(+)
 create mode 100644 _demo/cppmintf/cpp_multi_intf.go
 create mode 100644 _demo/cppmintf/foo/bar/bar.cpp
 create mode 100644 _demo/cppmintf/foo/foo.go
 create mode 100644 _demo/cppmintf/foo/llgo_autogen.lla

diff --git a/_demo/cppmintf/cpp_multi_intf.go b/_demo/cppmintf/cpp_multi_intf.go
new file mode 100644
index 00000000..38e5797e
--- /dev/null
+++ b/_demo/cppmintf/cpp_multi_intf.go
@@ -0,0 +1,50 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/_demo/cppmintf/foo"
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/math"
+)
+
+type Bar struct {
+	foo.Callback
+	a int
+}
+
+func NewBar(a int) *Bar {
+	return &Bar{
+		Callback: foo.Callback{
+			ICalc: foo.ICalc{
+				Vptr: &foo.ICalcVtbl{
+					Calc: c.Func((*Bar).sqrt),
+				},
+			},
+			IVal: foo.IVal{
+				Vptr: &foo.IValVtbl{
+					Val: c.Func(bar_IVal_getA),
+				},
+			},
+		},
+		a: a,
+	}
+}
+
+func (p *Bar) getA() int {
+	return p.a
+}
+
+func bar_IVal_getA(this c.Pointer) int {
+	const delta = -int(unsafe.Offsetof(foo.Callback{}.IVal))
+	return (*Bar)(c.Advance(this, delta)).getA()
+}
+
+func (p *Bar) sqrt(v float64) float64 {
+	return math.Sqrt(v)
+}
+
+func main() {
+	bar := NewBar(1)
+	foo.F(&bar.Callback)
+}
diff --git a/_demo/cppmintf/foo/bar/bar.cpp b/_demo/cppmintf/foo/bar/bar.cpp
new file mode 100644
index 00000000..99c6e97d
--- /dev/null
+++ b/_demo/cppmintf/foo/bar/bar.cpp
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#define interface struct
+
+interface ICalc {
+	virtual double calc(double v) = 0;
+};
+
+interface IVal {
+	virtual int val() = 0;
+};
+
+class Callback : public ICalc, public IVal {
+};
+
+extern "C" void f(Callback* cb) {
+	printf("val: %d\ncalc(2): %lf\n", cb->val(), cb->calc(2));
+}
diff --git a/_demo/cppmintf/foo/foo.go b/_demo/cppmintf/foo/foo.go
new file mode 100644
index 00000000..a318db70
--- /dev/null
+++ b/_demo/cppmintf/foo/foo.go
@@ -0,0 +1,42 @@
+package foo
+
+import (
+	"unsafe"
+)
+
+const (
+	LLGoFiles   = "bar/bar.cpp"
+	LLGoPackage = "link"
+)
+
+// -----------------------------------------------------------------------------
+
+type ICalc struct {
+	Vptr *ICalcVtbl
+}
+
+type ICalcVtbl struct {
+	Calc unsafe.Pointer
+}
+
+// -----------------------------------------------------------------------------
+
+type IVal struct {
+	Vptr *IValVtbl
+}
+
+type IValVtbl struct {
+	Val unsafe.Pointer
+}
+
+// -----------------------------------------------------------------------------
+
+type Callback struct {
+	ICalc
+	IVal
+}
+
+//go:linkname F C.f
+func F(cb *Callback)
+
+// -----------------------------------------------------------------------------
diff --git a/_demo/cppmintf/foo/llgo_autogen.lla b/_demo/cppmintf/foo/llgo_autogen.lla
new file mode 100644
index 0000000000000000000000000000000000000000..86c4cc60eb1532abbabe5541c544cb0edf581145
GIT binary patch
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literal 0
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