fix: Fixed the issue of examples failing to compile under MSVC

examples/context-engineering/context-engineering.cpp

@@ -8,14 +8,14 @@
 #include "llama.h"
 #include "logging_callback.h"
 #include "model.h"
+#include "platform_compat.h"
 #include "tool.h"
 #include <algorithm>
 #include <cstdio>
 #include <cstring>
 #include <functional>
 #include <iostream>
 #include <string>
-#include <unistd.h>
 
 static constexpr size_t DEFAULT_MAX_TOOL_CALLS = 1;
 

examples/memory/memory.cpp

@@ -15,7 +15,6 @@
 #include <iostream>
 #include <map>
 #include <string>
-#include <unistd.h>
 
 using agent_cpp::json;
 

examples/multi-agent/multi-agent.cpp

@@ -15,7 +15,6 @@
 #include <iostream>
 #include <memory>
 #include <string>
-#include <unistd.h>
 
 using agent_cpp::json;
 

examples/shared/chat_loop.h

@@ -2,10 +2,10 @@
 
 #include "agent.h"
 #include "chat.h"
+#include "platform_compat.h"
 #include <cstdio>
 #include <iostream>
 #include <string>
-#include <unistd.h>
 #include <vector>
 
 // Run an interactive chat loop with the given agent.

examples/shared/logging_callback.h

@@ -1,10 +1,10 @@
 #pragma once
 
 #include "callbacks.h"
+#include "platform_compat.h"
 #include "tool_result.h"
 #include <cstdio>
 #include <string>
-#include <unistd.h>
 
 // Logging callback to display tool execution information.
 // Shared across examples to provide consistent tool call logging.

examples/shared/platform_compat.h

@@ -0,0 +1,16 @@
+#pragma once
+
+// Small compatibility shim so the examples build with MSVC, which does not
+// ship <unistd.h> and prefixes the POSIX names with an underscore.
+// Shared across examples to avoid repeating the same #ifdef block.
+
+#ifdef _WIN32
+#include <io.h>
+
+#define isatty _isatty
+#define popen _popen
+#define pclose _pclose
+
+#else
+#include <unistd.h>
+#endif // _WIN32

examples/shell/shell.cpp

@@ -6,6 +6,7 @@
 #include "error_recovery_callback.h"
 #include "llama.h"
 #include "model.h"
+#include "platform_compat.h"
 #include "tool.h"
 
 #include <algorithm>
@@ -15,7 +16,6 @@
 #include <iostream>
 #include <memory>
 #include <string>
-#include <unistd.h>
 
 using agent_cpp::json;
 using agent_cpp::ToolExecutionSkipped;

examples/tracing/tracing.cpp

@@ -28,7 +28,6 @@
 #include <iostream>
 #include <memory>
 #include <string>
-#include <unistd.h>
 #include <vector>
 
 namespace trace_api = opentelemetry::trace;