feat: cpp testdata

Author: zyl1314

testdata/cpp/0_simple/main.cpp

@@ -0,0 +1,17 @@
+#include "util.h"
+#include <iostream>
+
+int main() {
+    std::cout << "app=" << util::g_appName << "\n";
+    std::cout << "g_counter=" << util::g_counter << "\n";
+
+    util::Greeter hi("Hello");
+    std::cout << hi.greet("Alice") << "\n";
+
+    hi.bump();
+    hi.bump();
+
+    std::cout << "g_counter=" << util::g_counter << "\n";
+    std::cout << "hi.localCount()=" << hi.localCount() << "\n";
+    return 0;
+}

testdata/cpp/0_simple/util.cpp

@@ -0,0 +1,26 @@
+#include "util.h"
+#include <utility>  // std::move
+
+namespace util {
+
+// ===== 全局变量（定义，只能在一个 .cpp 中定义）=====
+int g_counter = 0;
+const std::string g_appName = "DemoApp";
+
+// ===== 类实现 =====
+Greeter::Greeter(std::string prefix) : prefix_(std::move(prefix)) {}
+
+std::string Greeter::greet(const std::string& name) const {
+    return prefix_ + ", " + name + "!";
+}
+
+void Greeter::bump() {
+    ++g_counter;
+    ++localCount_;
+}
+
+int Greeter::localCount() const {
+    return localCount_;
+}
+
+} // namespace util

testdata/cpp/0_simple/util.h

@@ -0,0 +1,28 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+#include <string>
+
+namespace util {
+
+// ===== 全局变量（声明）=====
+extern int g_counter;
+extern const std::string g_appName;
+
+// ===== 类声明 =====
+class Greeter {
+public:
+    explicit Greeter(std::string prefix);
+
+    std::string greet(const std::string& name) const;
+    void bump();
+    int localCount() const;
+
+private:
+    std::string prefix_;
+    int localCount_{0};
+};
+
+} // namespace util
+
+#endif // UTIL_H