nearby: snapshot as of cl/296436629

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I2cf5bf225b76f4c1541954651f3a7544a14e0cec

cpp/platform/port/BUILD

@@ -0,0 +1,38 @@
+cc_library(
+    name = "config",
+    hdrs = [
+        "config.h",
+    ],
+    visibility = [
+        "//visibility:private",
+    ],
+)
+
+cc_library(
+    name = "string",
+    hdrs = [
+        "string.h",
+    ],
+    visibility = [
+        "//core:__subpackages__",
+        "//platform:__subpackages__",
+        "//location/nearby/setup/core:__subpackages__",
+    ],
+    deps = [
+        ":config",
+    ],
+)
+
+cc_library(
+    name = "down_cast",
+    hdrs = [
+        "down_cast.h",
+    ],
+    visibility = [
+        "//core:__subpackages__",
+        "//platform:__subpackages__",
+    ],
+    deps = [
+        ":config",
+    ],
+)

cpp/platform/port/config.h

@@ -0,0 +1,22 @@
+#ifndef PLATFORM_PORT_CONFIG_H_
+#define PLATFORM_PORT_CONFIG_H_
+
+// Clients can modify this file to customize the Nearby C++ codebase as per
+// their particular constraints and environments.
+
+// Note: Every entry in this file should conform to the following format, to
+// give precedence to command-line options (-D) that set these symbols:
+//
+//   #ifndef XXX
+//   #define XXX 0/1
+//   #endif
+
+#ifndef NEARBY_USE_STD_STRING
+#define NEARBY_USE_STD_STRING 0
+#endif
+
+#ifndef NEARBY_USE_RTTI
+#define NEARBY_USE_RTTI 1
+#endif
+
+#endif  // PLATFORM_PORT_CONFIG_H_

cpp/platform/port/down_cast.h

@@ -0,0 +1,12 @@
+#ifndef PLATFORM_PORT_DOWN_CAST_H_
+#define PLATFORM_PORT_DOWN_CAST_H_
+
+#include "platform/port/config.h"
+
+#if NEARBY_USE_RTTI
+#define DOWN_CAST dynamic_cast
+#else
+#define DOWN_CAST static_cast
+#endif
+
+#endif  // PLATFORM_PORT_DOWN_CAST_H_

cpp/platform/port/string.h

@@ -0,0 +1,12 @@
+#ifndef PLATFORM_PORT_STRING_H_
+#define PLATFORM_PORT_STRING_H_
+
+#include <string>
+
+#include "platform/port/config.h"
+
+#if NEARBY_USE_STD_STRING
+using std::string;
+#endif
+
+#endif  // PLATFORM_PORT_STRING_H_