1.在C++中，全局static變量和class的static成員變量在main函數(shù)之前初始化，main函數(shù)之后銷毀

2. 函數(shù)內(nèi)部的局部static變量在該函數(shù)第一次被調(diào)用時初始化，在main函數(shù)之后銷毀

3.對于static數(shù)據(jù)即使是函數(shù)內(nèi)部的對象則存放在全局?jǐn)?shù)據(jù)區(qū)，全局?jǐn)?shù)據(jù)區(qū)的數(shù)據(jù)并不會因為函數(shù)的退出就將空間釋放。

#include <iostream>using namespace std;struct Date{Data(){cout<<"create"<<endl;}~Data(){cout<<"destroy"<<endl;}};static Data g_sData;int main(){cout << "main start" << endl;cout << "main end" << endl;return 0;}

output:

create
main begin
main end
destroy

#include <iostream>using namespace std;struct Date{Data(){cout<<"create"<<endl;}~Data(){cout<<"destroy"<<endl;}};class Test{static Data m_sData;};Data Test::m_sData;int main(){cout << "main start" << endl;cout << "main end" << endl;return 0;}
output:

create
main begin
main end
destroy

#include <iostream>using namespace std;struct Date{Data(){cout<<"create"<<endl;}~Data(){cout<<"destroy"<<endl;}};void test(){static Data sData;}int main(){cout << "main start" << endl;cout << "first time call test" << endl;test();cout << "second time call test" << endl;test();cout << "main end" << endl;return 0;}

main begin
first
create
second
main end
destroy

在看一個比較BT的題目。

在系統(tǒng)中只能調(diào)用一次函數(shù)

void caller() {cout<<"first call\n"; }void FirstCall() {static int d = (caller(),1); }int main() {FirstCall();FirstCall(); }

總結(jié)

以上是生活随笔為你收集整理的static变量初始化的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。