library: cpp/std; cpp/inih demo: inihreader

cpp/std/_cppstd/string.cpp

@@ -0,0 +1,43 @@
+#include <string>
+
+extern "C" {
+
+// -----------------------------------------------------------------------------
+
+void stdStringInitEmpty(std::string* s) {
+    new(s) std::string();
+}
+
+void stdStringInitFrom(std::string* s, std::string* v) {
+    new(s) std::string(*v);
+}
+
+void stdStringInitFromCStr(std::string* s, const char* cstr) {
+    new(s) std::string(cstr);
+}
+
+void stdStringInitFromCStrLen(std::string* s, const char* cstr, size_t len) {
+    new(s) std::string(cstr, len);
+}
+
+void stdStringDispose(const std::string* s) {
+    s->~basic_string();
+}
+
+// -----------------------------------------------------------------------------
+
+const char* stdStringCStr(const std::string* s) {
+    return s->c_str();
+}
+
+const char* stdStringData(const std::string* s) {
+    return s->data();
+}
+
+size_t stdStringSize(const std::string* s) {
+    return s->size();
+}
+
+// -----------------------------------------------------------------------------
+
+} // extern "C"

cpp/std/_demo/cpphello/cppstr.go

@@ -0,0 +1,12 @@
+package main
+
+import (
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/cpp/std"
+)
+
+func main() {
+	s := std.Str("Hello world\n")
+	c.Printf(s.CStr())
+	print(s.Str(), s.Size(), "\n")
+}

cpp/std/std.go

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package std
+
+const (
+	LLGoFiles   = "_cppstd/string.cpp"
+	LLGoPackage = "link: c++"
+)
+
+// -----------------------------------------------------------------------------

cpp/std/string.go

@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2024 The GoPlus Authors (goplus.org). All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package std
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/bdwgc"
+)
+
+// -----------------------------------------------------------------------------
+
+// String represents a C++ std::string object.
+type String struct {
+	Unused [24]byte
+}
+
+// llgo:link (*String).InitEmpty C.stdStringInitEmpty
+func (s *String) InitEmpty() {}
+
+// llgo:link (*String).InitFrom C.stdStringInitFrom
+func (s *String) InitFrom(v *String) {}
+
+// llgo:link (*String).InitFromCStr C.stdStringInitFromCStr
+func (s *String) InitFromCStr(cstr *c.Char) {}
+
+// llgo:link (*String).InitFromCStrLen C.stdStringInitFromCStrLen
+func (s *String) InitFromCStrLen(cstr *c.Char, n uintptr) {}
+
+// llgo:link (*String).Dispose C.stdStringDispose
+func (s *String) Dispose() {}
+
+// -----------------------------------------------------------------------------
+
+func allocString() *String {
+	ptr := bdwgc.Malloc(unsafe.Sizeof(String{}))
+	bdwgc.RegisterFinalizer(ptr, func(obj, data c.Pointer) {
+		(*String)(obj).Dispose()
+	}, nil, nil, nil)
+	return (*String)(ptr)
+}
+
+// NewString creates a C++ std::string object.
+func NewString(v string) *String {
+	ret := allocString()
+	ret.InitFromCStrLen(c.GoStringData(v), uintptr(len(v)))
+	return ret
+}
+
+// NewStringEmpty creates an empty std::string object.
+func NewStringEmpty() *String {
+	ret := allocString()
+	ret.InitEmpty()
+	return ret
+}
+
+// NewStringFrom creates a copy of a C++ std::string object.
+func NewStringFrom(v *String) *String {
+	ret := allocString()
+	ret.InitFrom(v)
+	return ret
+}
+
+// NewStringFromCStr creates a C++ std::string object.
+func NewStringFromCStr(cstr *c.Char) *String {
+	ret := allocString()
+	ret.InitFromCStr(cstr)
+	return ret
+}
+
+// NewStringFromCStrLen creates a C++ std::string object.
+func NewStringFromCStrLen(cstr *c.Char, n uintptr) *String {
+	ret := allocString()
+	ret.InitFromCStrLen(cstr, n)
+	return ret
+}
+
+// -----------------------------------------------------------------------------
+
+// Str returns a Go string (it doesn't clone data of the C++ std::string object).
+func (s *String) Str() string {
+	return unsafe.String((*byte)(unsafe.Pointer(s.Data())), s.Size())
+}
+
+// llgo:link (*String).CStr C.stdStringCStr
+func (s *String) CStr() *c.Char { return nil }
+
+// llgo:link (*String).Data C.stdStringData
+func (s *String) Data() *c.Char { return nil }
+
+// llgo:link (*String).Size C.stdStringSize
+func (s *String) Size() uintptr { return 0 }
+
+// -----------------------------------------------------------------------------
+
+// GoString converts a C++ std::string object to a Go string.
+func GoString(v *String) string {
+	return c.GoString(v.Data(), v.Size())
+}
+
+// Str creates a constant C++ std::string object.
+func Str(v string) *String {
+	return NewString(v) // TODO(xsw): optimize it
+}
+
+// -----------------------------------------------------------------------------