前言

在c++中參數(shù)傳遞有兩種形式：值傳遞和引用傳遞。這兩種方式的區(qū)別我不在此說，自行補(bǔ)上，如果你不知道的話。我先上python代碼，看完我們總結(jié)一下，代碼如下：

# copy module importimport copy# number and stringa = 12a1 = aa2 = copy.copy(a)a3 = copy.deepcopy(a)# look addrprint("==========number=======")print(id(a))print(id(a1))print(id(a2))print(id(a3))s = '12345's1 = ss2 = copy.copy(s)s3 = copy.deepcopy(s)# look addrprint("==========String=======")print(id(s))print(id(s1))print(id(s2))print(id(s3))# otherstarget = {  'name': 'ckmike',  'age': 25,  'boxes':[    'LV',    'Prada',    'KUQI'  ]}target1 = targettarget2 = copy.copy(target)target3 = copy.deepcopy(target)print("==========dict-1=======")print(id(target))print(id(target1))print(id(target2))print(id(target3))print("==========dict-2=======")print(id(target['boxes']))print(id(target1['boxes']))print(id(target2['boxes']))print(id(target3['boxes']))

輸出結(jié)果：

==========number=======
10943360
10943360
10943360
10943360
==========String=======
140567123944648
140567123944648
140567123944648
140567123944648
==========dict-1=======
140567124625088
140567124625088
140567124625160
140567123938760
==========dict-2=======
140567099339272
140567099339272
140567099339272
140567099339464

總結(jié)：

對于數(shù)值、字符串而言，不管是賦值符號還是淺拷貝、深拷貝，都是引用的內(nèi)存中的同一份值，變量指向同一地址。
對于非數(shù)值非字符串而言，淺拷貝只會拷貝對象的第一層，深拷貝則會把所有層都進(jìn)行拷貝。