3.8.1

sdk/Objective-C/XSHttpTool/Singleton.h

@@ -0,0 +1,26 @@
+// .h
+#define singleton_interface(class) + (instancetype)shared##class;
+
+// .m
+#define singleton_implementation(class) \
+static class *_instance; \
+\
++ (id)allocWithZone:(struct _NSZone *)zone \
+{ \
+    static dispatch_once_t onceToken; \
+    dispatch_once(&onceToken, ^{ \
+        _instance = [super allocWithZone:zone]; \
+    }); \
+\
+    return _instance; \
+} \
+\
++ (instancetype)shared##class \
+{ \
+    if (_instance == nil) { \
+        _instance = [[class alloc] init]; \
+    } \
+\
+    return _instance; \
+}
+