bignerdranch · March 9, 2012 13:51 · Mar 9, 2012 · Mar 9, 2012 · Mar 9, 2012 · Mar 9, 2012
diff --git a/main.m b/main.m
@@ -13,7 +13,7 @@ int main (void) {
                 [thing1 isEqual: thing2];
             }
         });
-    printf ("isEqualTo: time: %f\n", time);
+    printf ("isEqual: time: %f\n", time);
 
     time = BNRTimeBlock(^{
             for (int i = 0; i < LOOPAGE; i++) {

diff --git a/main.m b/main.m
@@ -10,7 +10,7 @@ int main (void) {
 
     time = BNRTimeBlock(^{
             for (int i = 0; i < LOOPAGE; i++) {
-                [thing1 isEqualTo: thing2];
+                [thing1 isEqual: thing2];
             }
         });
     printf ("isEqualTo: time: %f\n", time);

diff --git a/main.m b/main.m
@@ -0,0 +1,26 @@
+#define LOOPAGE 10000000
+
+#import "BNRTimeBlock.h"
+
+int main (void) {
+    CGFloat time;
+
+    NSString *thing1 = @"hi";
+    NSString *thing2 = @"hello there";
+
+    time = BNRTimeBlock(^{
+            for (int i = 0; i < LOOPAGE; i++) {
+                [thing1 isEqualTo: thing2];
+            }
+        });
+    printf ("isEqualTo: time: %f\n", time);
+
+    time = BNRTimeBlock(^{
+            for (int i = 0; i < LOOPAGE; i++) {
+                [thing1 isEqualToString: thing2];
+            }
+        });
+    printf ("isEqualToString: time: %f\n", time);
+
+    return 0;
+} // main
diff --git a/BNRTimeBlock.h b/BNRTimeBlock.h
@@ -0,0 +1 @@
+CGFloat BNRTimeBlock (void (^block)(void));
diff --git a/main.m b/main.m
@@ -1,24 +0,0 @@
-#define LOOPAGE 10000000
-
-int main (void) {
-    CGFloat time;
-
-    NSString *thing1 = @"hi";
-    NSString *thing2 = @"hello there";
-
-    time = BNRTimeBlock(^{
-            for (int i = 0; i < LOOPAGE; i++) {
-                [thing1 isEqualTo: thing2];
-            }
-        });
-    printf ("isEqualTo: time: %f\n", time);
-
-    time = BNRTimeBlock(^{
-            for (int i = 0; i < LOOPAGE; i++) {
-                [thing1 isEqualToString: thing2];
-            }
-        });
-    printf ("isEqualToString: time: %f\n", time);
-
-    return 0;
-} // main

diff --git a/BNRTimeBlock.m b/BNRTimeBlock.m
@@ -0,0 +1,15 @@
+#import <mach/mach_time.h>  // for mach_absolute_time() and friends
+
+CGFloat BNRTimeBlock (void (^block)(void)) {
+    mach_timebase_info_data_t info;
+    if (mach_timebase_info(&info) != KERN_SUCCESS) return -1.0;
+
+    uint64_t start = mach_absolute_time ();
+    block ();
+    uint64_t end = mach_absolute_time ();
+    uint64_t elapsed = end - start;
+
+    uint64_t nanos = elapsed * info.numer / info.denom;
+    return (CGFloat)nanos / NSEC_PER_SEC;
+
+} // BNRTimeBlock
diff --git a/main.m b/main.m
@@ -0,0 +1,24 @@
+#define LOOPAGE 10000000
+
+int main (void) {
+    CGFloat time;
+
+    NSString *thing1 = @"hi";
+    NSString *thing2 = @"hello there";
+
+    time = BNRTimeBlock(^{
+            for (int i = 0; i < LOOPAGE; i++) {
+                [thing1 isEqualTo: thing2];
+            }
+        });
+    printf ("isEqualTo: time: %f\n", time);
+
+    time = BNRTimeBlock(^{
+            for (int i = 0; i < LOOPAGE; i++) {
+                [thing1 isEqualToString: thing2];
+            }
+        });
+    printf ("isEqualToString: time: %f\n", time);
+
+    return 0;
+} // main