From daa3c30f4c38ae5bb833449da35160c06e3845ad Mon Sep 17 00:00:00 2001
From: mutouyun <orz@orzz.org>
Date: Tue, 1 Mar 2022 11:03:29 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0countof=20ut?=
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---
 test/test_utility.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/test/test_utility.cpp b/test/test_utility.cpp
index d2c3dae..6f4d47c 100644
--- a/test/test_utility.cpp
+++ b/test/test_utility.cpp
@@ -1,6 +1,7 @@
 
 #include <type_traits>  // std::aligned_storage_t
 #include <cstdint>
+#include <vector>
 
 #include "gtest/gtest.h"
 
@@ -86,3 +87,14 @@ TEST(utility, pimpl_inherit) {
   EXPECT_EQ(ipc::pimpl::get(pbar)->pj_, &j);
   pbar->clear();
 }
+
+TEST(utility, countof) {
+  struct {
+    constexpr int Size() const noexcept { return 3; }
+  } sv;
+  std::vector<int> vec {1, 2, 3, 4, 5};
+  int arr[] {7, 6, 5, 4, 3, 2, 1};
+  EXPECT_EQ(ipc::countof(sv) , sv.Size());
+  EXPECT_EQ(ipc::countof(vec), vec.size());
+  EXPECT_EQ(ipc::countof(arr), sizeof(arr) / sizeof(arr[0]));
+}