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document.write('@interface UIDevice (Additions)\n');
document.write('@property(readonly) double availableMemory; \n');
document.write('@end\n');
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document.write('#include <sys/sysctl.h> \n');
document.write('#include <mach/mach.h>\n');
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document.write('@implementation UIDevice (Additions)\n');
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document.write('- (double)availableMemory {\n');
document.write(' vm_statistics_data_t vmStats;\n');
document.write(' mach_msg_type_number_t infoCount = HOST_VM_INFO_COUNT;\n');
document.write(' kern_return_t kernReturn = host_statistics(mach_host_self(), HOST_VM_INFO, (host_info_t)&vmStats, &infoCount);\n');
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document.write(' if(kernReturn != KERN_SUCCESS) {\n');
document.write(' return NSNotFound;\n');
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document.write(' return ((vm_page_size * vmStats.free_count) / 1024.0) / 1024.0;\n');
document.write('}\n');
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document.write('@end\n');
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