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Kotlinの短絡評価について
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tommykw
June 28, 2018
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Kotlinの短絡評価について
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Transcript
$POOFIJUP*OD ϚϚͷҰาΛࢧ͑Δ ,PUMJOͷབྷධՁʹ͍ͭͯ
ా݈ೋ !UPNNZLX !UPNNZLX ίωώτגࣜձࣾ"OESPJE&OHJOFFS
αʔϏεհ ϚϚϦ
ಥવͰ͕͢ɺ࣍ͷͭͷ,PUMJOίʔυͷҧ͍͕ Θ͔Γ·͔͢ʁ
if (true || false) { } if (true or false)
{ }
if (true || false) { } if (true or false)
{ } ಉ͡Α͏ʹݟ͑Δ͕࣮ҟͳΔڍಈ
͋Εɺ͜ͷ͕ͭಉ͡ҙຯͩͱࢥ͍ͬͯͨʜʁ if (true || false) { } if (true or
false) { }
ຊ,PUMJOͷབྷධՁʹ͍ͭͯ
ૣʮPSʯɺʮBOEʯͷίʔυΛ͍ͯΈΔ
IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPC NBTUFSDPSFCVJMUJOTOBUJWFLPUMJO#PPMFBOLU
IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPC NBTUFSDPSFCVJMUJOTOBUJWFLPUMJO#PPMFBOLU UIJTGVODUJPOEPFTOPUTIPSUDJSDVJUFWBMVBUJPO
བྷධՁ TIPSUDJSDVJUFWBMVBUJPO ͱʁ
བྷධՁཧԋࢉࢠͷࠨลɺӈลͷධՁΛ ද͢ධՁํ๏Ͱ࠷খධՁͱݺΕΔɻ
if (true || false) { } བྷධՁ
if (true || false) { } བྷධՁ
if (true || false) { } ʮUSVFʯ͚ͩධՁ͞ΕΔ བྷධՁ
ҰํͰ௨ৗͷཧԋࢉࢠʁ
௨ৗͷཧԋࢉࢠ if (true or false) { }
if (true or false) { } ௨ৗͷཧԋࢉࢠ
if (true or false) { } ʮUSVFʯ͕ධՁ͞ΕΔ ௨ৗͷཧԋࢉࢠ
if (true or false) { } ʮUSVFʯ͕ධՁ͞ΕΔ ௨ৗͷཧԋࢉࢠ
if (true or false) { } ʮUSVFʯ͕ධՁ͞ΕΔ ʮGBMTFʯධՁ͞ΕΔ ௨ৗͷཧԋࢉࢠ
௨ৗͷཧԋࢉࢠͷར༻ํ๏ʁ
IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPCNBTUFSCVJME DPNNPOTSDPSHKFUCSBJOTLPUMJOJODSFNFOUBM *ODSFNFOUBM+WN$BDIFLU
IUUQTHJUIVCDPN+FU#SBJOTLPUMJOCMPCNBTUFSCVJME DPNNPOTSDPSHKFUCSBJOTLPUMJOJODSFNFOUBM *ODSFNFOUBM+WN$BDIFLU
"OESPJEͰͷར༻ intent.addFlags( Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP )
"OESPJEͰͷར༻ intent.addFlags( Intent.FLAG_ACTIVITY_SINGLE_TOP or Intent.FLAG_ACTIVITY_CLEAR_TOP ) Ϗοτԋࢉͱͯ͠ར༻͍ͯ͠Δ
+BWBͱ,PUMJOൺֱ
·ͱΊ
w ,PUMJOͷʮPSɺBOEʯɺʮccɺʯ ͱಉ͡ҙຯͰͳ͍ w བྷධՁͷཧԋࢉࢠɺ௨ৗͷཧԋࢉ ࢠ͕͋Δ
͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ