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namespace {
template <typename T, typename S, void (*Releaser)(S)>
struct CFHandle {
CFHandle(T t_): t(t_) {}
~CFHandle() { Releaser(t); }
T operator*() { return t; }
operator bool() { return t; }
private:
T t;
};
using CGImageHandle = CFHandle<CGImageRef, CGImageRef, CGImageRelease>;
using CFDataHandle = CFHandle<CFDataRef, CFTypeRef, CFRelease>;
using CGImageSourceHandle = CFHandle<CGImageSourceRef, CFTypeRef, CFRelease>;
using CGDataProviderHandle = CFHandle<CGDataProviderRef, CGDataProviderRef, CGDataProviderRelease>;
using CGColorSpaceHandle = CFHandle<CGColorSpaceRef, CGColorSpaceRef, CGColorSpaceRelease>;
using CGContextHandle = CFHandle<CGContextRef, CGContextRef, CGContextRelease>;
using CFStringRefHandle = CFHandle<CFStringRef, CFTypeRef, CFRelease>;
using CFAttributedStringRefHandle = CFHandle<CFAttributedStringRef, CFTypeRef, CFRelease>;
using CFDictionaryRefHandle = CFHandle<CFDictionaryRef, CFTypeRef, CFRelease>;
} // namespace
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