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+---
+title: NS ENSURE TRUE
+slug: Mozilla/Tech/XPCOM/Reference/NS_ENSURE_TRUE
+tags:
+  - XPCOM
+  - XPCOM_Macros
+translation_of: Mozilla/Tech/XPCOM/Reference/NS_ENSURE_TRUE
+---
+<h3 id="Summary" name="Summary">概要</h3>
+
+<p><strong>マクロ</strong></p>
+
+<p><em>expr</em> の評価値が <strong>false</strong> の場合に <em>return-value </em>を返す。</p>
+
+<h3 id="Syntax" name="Syntax">構文</h3>
+
+<pre>NS_ENSURE_TRUE( expr, return-value );
+</pre>
+
+<p> </p>
+
+<h3 id="Usage" name="Usage">使い方</h3>
+
+<pre>nsresult mozMyClass::MozStringMucking()
+{
+  char *foo = new char[123];
+  NS_ENSURE_TRUE(foo, NS_ERROR_OUT_OF_MEMORY);
+
+  // This is equivalent to doing:
+  // これは以下の式と同等です。
+  if (!foo)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  // Thou shalt not return NS_ERROR_FAILURE..
+  // これは、NS_ERROR_FAILURE を返さない。。
+  int i = 3;
+  NS_ENSURE_TRUE(i == 3, NS_ERROR_FAILURE);
+
+  return NS_OK;
+}
+
+char* mozMyClass::DoStuff()
+{
+  char* bar = new char[321];
+  NS_ENSURE_TRUE(bar, nsnull);
+
+  return bar;
+}
+</pre>