std::cin
Once std::cin is constructed, std::cin.tie() returns &std::cout,and likewise, std::wcin::tie() returns &std:;wcout. This means that any formatted input operation on std::in forces a call to std::cout.flush() if any characters are pending for output.
for example:
#include<iostream>
struct f{
int n;
f(){
std::cout<<"n:";//no flush needed
srd::cin>>n;
}
};
f a;//static object
int main(){
std::cout<<a.n<<endl;
std::cout<<a.n<<endl;
}
Output:
n:15
15
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