成都双流 网站建设中国建设银行网站

成都双流 网站建设,中国建设银行网站,网站开发服务合同属于什么合同,类似58同城网站建设多少钱1.SBO 小对象优化在了解SBO#xff0c;先来看看这道题#xff1a;s1 和 s2 ,谁更大#xff1f;在刚学习Cstring#xff0c;就容易陷入误区#xff0c;觉得s2更大#xff0c;因为它有数据。但数据真的存储在string本身吗#xff1f;并不是#xff0c;它存储在一片堆空…1.SBO 小对象优化在了解SBO先来看看这道题s1 和 s2 ,谁更大在刚学习Cstring就容易陷入误区觉得s2更大因为它有数据。但数据真的存储在string本身吗并不是它存储在一片堆空间内由stirng内部的指针指向该空间 我们之前实现了简单string其底层是_str,_size,_capacity 按照指针是4/8字节整型是4字节那答案会是12 / 16 吗答案是28 两个都是28 VS2019 32位系统下 那么这是为什么通过VS编译器我们可以发现如图看右边可以发现其底层多了一个字符串数组_Buf 16个字符的字符串数组可存储有效字符数为15一旦字符串存入的有效字符数大于15_Buf存不下了就会转到_Ptr 内这就是SBO 小对象优化SBO本质是以空间换时间。 对象比较小时就不去堆上开空间存在_Buf 上 比去堆上开空间更省时间缺点是可能浪费空间。如果对象太大 就在堆上开空间并用_Ptr 指向该空间。不会两边都存一点只会选择一边存储因此如果有SBO就需要判断字符串存在哪有效字符数 15 就是存堆空间上小于15 就是存_Buf 上2.写时拷贝写时拷贝就是一种拖延症是在浅拷贝的基础之上增加了引用计数的方式来实现的。2.1引用记数引用计数用来记录资源使用者的个数。在构造时将资源的计数给成1每增加一个对象使用该资源就给计数增加1语言可能有点抽象看图理解就是这片空间的使用者每多一个引用记数就1s1构造时引用记数变成1 s2拷贝构造的浅拷贝使s2也指向这空间那引用记数变成2也就是说引用记数是用来避免多次析构的当某个对象被销毁时先给该计数减1然后再检查是否需要释放资源空间 如果计数为1说明该对象是资源的最后一个使用者那他就负责这片资源的析构释放资源否则就不能释放因为还有其他对象在使用该资源重复析构有了上图的解释相信这句话就好理解很多。2.2引用记数的写时拷贝现在我们来了解写时拷贝。写时拷贝那就是 在写的时候才拷贝如图s2,s1都指向同一片资源 hello world如果此时我们要修改资源那就会使s2也被修改那写时拷贝的作用就来了如果引用记数是1那就直接写(修改如果引用记数不是1那就得老实深拷贝那最终还是要深拷贝为什么这么麻烦还搞引用记数其实这就是在赌你不需要深拷贝。因为深拷贝的代价很大早年编译器不优化深拷贝时需要来回释放开辟空间如果你不需要深拷贝浅拷贝能完成那就不深拷贝。实在不行再深拷贝。这样提高了效率不需要干什么都深拷贝。m.rhnlt.pro/ArTicle/11757.Htmm.rhnlt.pro/ArTicle/79719.Htmm.rhnlt.pro/ArTicle/24682.Htmm.rhnlt.pro/ArTicle/68046.Htmm.rhnlt.pro/ArTicle/44202.Htmm.rhnlt.pro/ArTicle/33995.Htmm.rhnlt.pro/ArTicle/84266.Htmm.rhnlt.pro/ArTicle/35555.Htmm.rhnlt.pro/ArTicle/46260.Htmm.rhnlt.pro/ArTicle/57197.Htmm.rhnlt.pro/ArTicle/35133.Htmm.rhnlt.pro/ArTicle/62442.Htmm.rhnlt.pro/ArTicle/57593.Htmm.rhnlt.pro/ArTicle/51913.Htmm.rhnlt.pro/ArTicle/75575.Htmm.rhnlt.pro/ArTicle/75777.Htmm.rhnlt.pro/ArTicle/93391.Htmm.rhnlt.pro/ArTicle/35575.Htmm.rhnlt.pro/ArTicle/57393.Htmm.rhnlt.pro/ArTicle/91717.Htmm.rhnlt.pro/ArTicle/37917.Htmm.rhnlt.pro/ArTicle/39713.Htmm.rhnlt.pro/ArTicle/19999.Htmm.rhnlt.pro/ArTicle/13943.Htmm.rhnlt.pro/ArTicle/17797.Htmm.rhnlt.pro/ArTicle/57117.Htmm.rhnlt.pro/ArTicle/53777.Htmm.rhnlt.pro/ArTicle/19555.Htmm.rhnlt.pro/ArTicle/97931.Htmm.rhnlt.pro/ArTicle/17917.Htmm.rhnlt.pro/ArTicle/59995.Htmm.rhnlt.pro/ArTicle/26004.Htmm.rhnlt.pro/ArTicle/33979.Htmm.rhnlt.pro/ArTicle/79795.Htmm.rhnlt.pro/ArTicle/19337.Htmm.rhnlt.pro/ArTicle/77371.Htmm.rhnlt.pro/ArTicle/13599.Htmm.rhnlt.pro/ArTicle/99553.Htmm.rhnlt.pro/ArTicle/99511.Htmm.rhnlt.pro/ArTicle/80848.Htmm.rhnlt.pro/ArTicle/19733.Htmm.rhnlt.pro/ArTicle/19711.Htmm.rhnlt.pro/ArTicle/33771.Htmm.rhnlt.pro/ArTicle/44668.Htmm.rhnlt.pro/ArTicle/15399.Htmm.rhnlt.pro/ArTicle/13491.Htmm.rhnlt.pro/ArTicle/93571.Htmm.rhnlt.pro/ArTicle/53177.Htmm.rhnlt.pro/ArTicle/11317.Htmm.rhnlt.pro/ArTicle/46046.Htmm.rhnlt.pro/ArTicle/68620.Htmm.rhnlt.pro/ArTicle/97313.Htmm.rhnlt.pro/ArTicle/19777.Htmm.rhnlt.pro/ArTicle/68466.Htmm.rhnlt.pro/ArTicle/37777.Htmm.rhnlt.pro/ArTicle/02280.Htmm.rhnlt.pro/ArTicle/99339.Htmm.rhnlt.pro/ArTicle/97377.Htmm.rhnlt.pro/ArTicle/57337.Htmm.rhnlt.pro/ArTicle/73913.Htmm.rhnlt.pro/ArTicle/73593.Htmm.rhnlt.pro/ArTicle/15335.Htmm.rhnlt.pro/ArTicle/95377.Htmm.rhnlt.pro/ArTicle/13795.Htmm.rhnlt.pro/ArTicle/91979.Htmm.rhnlt.pro/ArTicle/75913.Htmm.rhnlt.pro/ArTicle/33975.Htmm.rhnlt.pro/ArTicle/19779.Htmm.rhnlt.pro/ArTicle/31513.Htmm.rhnlt.pro/ArTicle/73931.Htmm.rhnlt.pro/ArTicle/17757.Htmm.rhnlt.pro/ArTicle/91519.Htmm.rhnlt.pro/ArTicle/97133.Htmm.rhnlt.pro/ArTicle/68808.Htmm.rhnlt.pro/ArTicle/68448.Htmm.rhnlt.pro/ArTicle/79953.Htmm.rhnlt.pro/ArTicle/97191.Htmm.rhnlt.pro/ArTicle/51199.Htmm.rhnlt.pro/ArTicle/44002.Htmm.rhnlt.pro/ArTicle/17513.Htmm.rhnlt.pro/ArTicle/15359.Htmm.rhnlt.pro/ArTicle/48444.Htmm.rhnlt.pro/ArTicle/55113.Htmm.rhnlt.pro/ArTicle/15319.Htmm.rhnlt.pro/ArTicle/37173.Htmm.rhnlt.pro/ArTicle/86240.Htmm.rhnlt.pro/ArTicle/77775.Htmm.rhnlt.pro/ArTicle/39511.Htmm.rhnlt.pro/ArTicle/97991.Htmm.rhnlt.pro/ArTicle/68886.Htmm.rhnlt.pro/ArTicle/53933.Htmm.rhnlt.pro/ArTicle/53191.Htmm.rhnlt.pro/ArTicle/51333.Htmm.rhnlt.pro/ArTicle/03059.Htmm.rhnlt.pro/ArTicle/53751.Htmm.rhnlt.pro/ArTicle/53711.Htmm.rhnlt.pro/ArTicle/39933.Htmm.rhnlt.pro/ArTicle/22428.Htmm.rhnlt.pro/ArTicle/71935.Htmm.rhnlt.pro/ArTicle/31731.Htmm.rhnlt.pro/ArTicle/53715.Htmm.rhnlt.pro/ArTicle/04680.Htmm.rhnlt.pro/ArTicle/84680.Htmm.rhnlt.pro/ArTicle/95751.Htmm.rhnlt.pro/ArTicle/55575.Htmm.rhnlt.pro/ArTicle/60686.Htmm.rhnlt.pro/ArTicle/71311.Htmm.rhnlt.pro/ArTicle/59115.Htmm.rhnlt.pro/ArTicle/77517.Htmm.rhnlt.pro/ArTicle/72178.Htmm.rhnlt.pro/ArTicle/79591.Htmm.rhnlt.pro/ArTicle/53353.Htmm.rhnlt.pro/ArTicle/95715.Htmm.rhnlt.pro/ArTicle/95315.Htmm.rhnlt.pro/ArTicle/24466.Htmm.rhnlt.pro/ArTicle/13553.Htmm.rhnlt.pro/ArTicle/91917.Htmm.rhnlt.pro/ArTicle/20820.Htmm.rhnlt.pro/ArTicle/08260.Htmm.rhnlt.pro/ArTicle/13535.Htmm.rhnlt.pro/ArTicle/91359.Htmm.rhnlt.pro/ArTicle/08466.Htmm.rhnlt.pro/ArTicle/55199.Htmm.rhnlt.pro/ArTicle/75957.Htmm.rhnlt.pro/ArTicle/33511.Htmm.rhnlt.pro/ArTicle/71837.Htmm.rhnlt.pro/ArTicle/99753.Htmm.rhnlt.pro/ArTicle/39173.Htmm.rhnlt.pro/ArTicle/55759.Htmm.rhnlt.pro/ArTicle/31135.Htmm.rhnlt.pro/ArTicle/91793.Htmm.rhnlt.pro/ArTicle/35155.Htmm.rhnlt.pro/ArTicle/75557.Htmm.rhnlt.pro/ArTicle/77539.Htmm.rhnlt.pro/ArTicle/15131.Htmm.rhnlt.pro/ArTicle/59351.Htmm.rhnlt.pro/ArTicle/86660.Htmm.rhnlt.pro/ArTicle/20080.Htmm.rhnlt.pro/ArTicle/37711.Htmm.rhnlt.pro/ArTicle/93935.Htmm.rhnlt.pro/ArTicle/31933.Htmm.rhnlt.pro/ArTicle/19939.Htmm.rhnlt.pro/ArTicle/48020.Htmm.rhnlt.pro/ArTicle/79739.Htmm.rhnlt.pro/ArTicle/77977.Htmm.rhnlt.pro/ArTicle/55715.Htmm.rhnlt.pro/ArTicle/51171.Htmm.rhnlt.pro/ArTicle/15959.Htmm.rhnlt.pro/ArTicle/99539.Htmm.rhnlt.pro/ArTicle/84686.Htmm.rhnlt.pro/ArTicle/13717.Htmm.rhnlt.pro/ArTicle/42020.Htmm.rhnlt.pro/ArTicle/20004.Htmm.rhnlt.pro/ArTicle/75159.Htmm.rhnlt.pro/ArTicle/57199.Htmm.rhnlt.pro/ArTicle/59975.Htmm.rhnlt.pro/ArTicle/00288.Htmm.rhnlt.pro/ArTicle/95793.Htmm.rhnlt.pro/ArTicle/35779.Htmm.rhnlt.pro/ArTicle/42820.Htmm.rhnlt.pro/ArTicle/57195.Htmm.rhnlt.pro/ArTicle/79597.Htmm.rhnlt.pro/ArTicle/31357.Htmm.rhnlt.pro/ArTicle/59399.Htmm.rhnlt.pro/ArTicle/55719.Htmm.rhnlt.pro/ArTicle/93313.H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