Exceptions in 64-Bit Executables

Exceptions in 64-Bit ExecutablesThe Objective-C runtime has reimplemented the exception mechanism for 64-bit executables to provide zero-cost @try blocks and interoperability with C++ exceptions. Zero-Cost @try Blocks64-bit processes that enter a zero-cost @try block incur no performance penalty. This is unlike the mechanism for 32-bit processes, which calls setjmp() and performs additional “bookk

[ginpei]

64 bits環境ではObj-Cのtryは"zero-cost"で処理される。代わりにthrowはより高コスト。あとC++と連携する場合の注意点。