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| # [swift的enum的内存布局研究](https://github.com/platojobs/SFLOG/issues/184) | ||
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| ```swift | ||
| enum Password { | ||
| case number(Int, Int,Int,Int) | ||
| case other | ||
| } | ||
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| var pwd = Password.number(9, 8, 6, 4) | ||
| pwd = .other | ||
| print(MemoryLayout.stride(ofValue: pwd)) // 40 系统分配的 | ||
| print(MemoryLayout.size(ofValue: pwd)) // 33 实际用到的 | ||
| print(MemoryLayout.alignment(ofValue: pwd)) // 8 对齐单位 | ||
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| enum TestRnum { | ||
| case test1 , test2,test3 | ||
| } | ||
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| var tt = TestRnum.test1 | ||
| print(MemoryLayout.stride(ofValue: tt)) // 1 | ||
| print(MemoryLayout.size(ofValue: tt)) //1 | ||
| print(MemoryLayout.alignment(ofValue: tt)) //1 | ||
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| enum TestRnum11{ | ||
| case test(Int) | ||
| } | ||
| var tt11 = TestRnum11.test(12) | ||
| print(MemoryLayout.stride(ofValue: tt11)) // 8 | ||
| print(MemoryLayout.size(ofValue: tt11)) //8 | ||
| print(MemoryLayout.alignment(ofValue: tt11)) //8 | ||
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| enum TestEnum22 { | ||
| case test1(Int,Int,Int) | ||
| case test2(Int,Int) | ||
| case test3(Int) | ||
| case test4(Bool) | ||
| } | ||
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| var tt22 = TestEnum22.test1(1, 2, 3) | ||
| print(MemoryLayout.stride(ofValue: tt22)) // 32 | ||
| print(MemoryLayout.size(ofValue: tt22)) // 25 | ||
| print(MemoryLayout.alignment(ofValue: tt22)) // 8 | ||
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| enum TestEnum33 { | ||
| case test0 | ||
| case test1 | ||
| case test2(Int , Int) | ||
| case test3(Int,Int,Int) | ||
| case test4(Int,Int,Int,Bool) | ||
| } | ||
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| var test33 = TestEnum33.test0 | ||
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| print(MemoryLayout.stride(ofValue: test33)) // 32 | ||
| print(MemoryLayout.size(ofValue: test33)) // 25 | ||
| print(MemoryLayout.alignment(ofValue: test33)) // 8 | ||
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| enum TestEnum44 { | ||
| case test0 | ||
| case test1 | ||
| case test2(Int , Int) | ||
| case test3(Int,Int,Int) | ||
| case test4(Int,Bool,Int,Int) | ||
| } | ||
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| var test44 = TestEnum44.test0 | ||
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| print(MemoryLayout.stride(ofValue: test44)) // 40 | ||
| print(MemoryLayout.size(ofValue: test44)) // 33 | ||
| print(MemoryLayout.alignment(ofValue: test44)) // 8 | ||
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| enum TestEnum55 { | ||
| case test0 | ||
| case test1 | ||
| case test2(Int ,Int) | ||
| case test3(Int,Int,Int) | ||
| case test4(Bool,Int,Int,Int) | ||
| } | ||
| var test55 = TestEnum55.test0 | ||
| print(MemoryLayout.stride(ofValue: test55)) // 40 | ||
| print(MemoryLayout.size(ofValue: test55)) // 33 | ||
| print(MemoryLayout.alignment(ofValue: test55)) // 8 | ||
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| enum Test00{ | ||
| case enum1(t1:Int) | ||
| case enum2(t1:Int8,t2:Int16,t3:Int) // 1,2,8 | ||
| case enum3(t1:Int8,t2:Int,t3:Int16,t4:Int32) | ||
| case enum4(t1:Int8,t2:Int,t3:Int16,t4:Int,t5:Int8,t6:String) //(1,8,2,8,1,16) | ||
| } | ||
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| var testddd = Test00.enum1(t1: 1) | ||
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| print(MemoryLayout.stride(ofValue: testddd)) // 56 | ||
| print(MemoryLayout.size(ofValue: testddd)) // 56 | ||
| print(MemoryLayout.alignment(ofValue: testddd)) // 8 | ||
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| ``` |
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