Sketch SkFunction

tests/FunctionTest.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkFunction.h"
+#include "Test.h"
+
+static void test_add_five(skiatest::Reporter* r, SkFunction<int(int)>&& f) {
+    REPORTER_ASSERT(r, f(4) == 9);
+}
+
+static int add_five(int x) { return x + 5; }
+
+struct AddFive {
+    int operator()(int x) { return x + 5; };
+};
+
+DEF_TEST(Function, r) {
+    // We should be able to turn a static function, an explicit functor, or a lambda
+    // all into an SkFunction equally well.
+    test_add_five(r, SkFunction<int(int)>(&add_five));
+    test_add_five(r, SkFunction<int(int)>(AddFive()));
+    test_add_five(r, SkFunction<int(int)>([](int x) { return x + 5; }));
+}