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Implementation of getline in a while loop comparison


Implementation of getline in a while loop comparison

By : user2950968
Date : November 17 2020, 11:58 AM
it fixes the issue The problem with your code is that getline(std::cin, str) returns a istream& , which is not a string literal. For more information on std::getline.
code :


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How to have the 'string line' in the same scope as the 'getline(in,line)' in a 'while(getline(...))' loop?

How to have the 'string line' in the same scope as the 'getline(in,line)' in a 'while(getline(...))' loop?


By : walli
Date : March 29 2020, 07:55 AM
Hope that helps Example: , A for loop will work, I do this all the time:
code :
for (std::string line;
     getline(in,line); )
{
}
Implementation of getline ( istream& is, string& str )

Implementation of getline ( istream& is, string& str )


By : mboi.coy
Date : March 29 2020, 07:55 AM
Hope this helps getline(istream&, string&) is implemented in a way that it reads a line. There is no definitive implementation for it; each library probably differs from one another.
Possible implementation:
code :
istream& getline(istream& stream, string& str)
{
  char ch;
  str.clear();
  while (stream.get(ch) && ch != '\n')
    str.push_back(ch);
  return stream;
}
My getLine implementation only works the first time

My getLine implementation only works the first time


By : Romiyo Raj
Date : March 29 2020, 07:55 AM
this one helps. The getLine function works correctly, but the print-loops are the cause for the garbage output.
You print the output with
code :
while((c=line_1[i++]) != EOF){
    putchar(c);
}
while((c=line_1[i++]) != '\0'){
    putchar(c);
}
printf("%s", line_1);
fputs(line_1, stdout);
Custom getline() Implementation - for inside a while loop

Custom getline() Implementation - for inside a while loop


By : Calvin Giles
Date : March 29 2020, 07:55 AM
I wish did fix the issue.
How is it ... (various stuff does not occur) but not print the result until enter key pressed?
Multiple getline implementation

Multiple getline implementation


By : user3501395
Date : March 29 2020, 07:55 AM
To fix the issue you can do
it seems to me that getlines(first) is not returned? Would while still evaluate if nothing is input on s1?
code :
template<typename F>
std::istream& getlines(F& first)
{
    return std::getline(std::cin, first);
}

template<typename F, typename...O>
std::istream& getlines(F& first, O&... others)
{
    static_assert(std::is_same_v<decltype(first), std::string&>, "error: template getlines must be of std::string type");
    if (! getlines(first)) return std::cin;
    return getlines(others...);
}
template<typename... Strings>
std::istream & getlines(Strings &... strings) {
    for (auto & str : {std::ref(strings)...}) {
        if (! std::getline(std::cin, str.get())) break;
    }
    return std::cin;
}

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