Adam Lee questions

• What does resignFirstResponder mean?
• What's the main difference between B-Rep and Mesh index represation
• why the second writeline print out 12 when using lambda?
• why I received the error "llvm-dis: Invalid bitcode signature"
• What does @- mean in the following method? [duplicate]
• How to change the eclipse hot key?
• any public api which I can test jsonp ajax call?
• How to determine the system DirectX is 11 or 11.1?
• How to construct a string based on UTF8?
• why need typedef in the C++ enum definition [duplicate]

Adam Lee answers