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Why do we use std;:ofstream for output and std::ifstream for input if it is possible to use std::fstream for both?
This is the similar case as with stringstream, istringstream and ostringsstream (link).
Usually you don't both read and write from the same stream, so using ifstream and ofstream is easier as you don't have to bother about the stream state and stream positions (as is the case with fstream).
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ofstream out_data1, out_data2;
vector<ofstream> {out_data1, out_data2};
Error image :
Why is this happening? How can I solve it?
If you take a careful look at this link, you will understand that you are trying to copy an ofstream object, and the copy constructor of ofstream is deleted. That is what the error is telling you. You could have simply searched for the error on Google though ;)
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After some time implementing my own streambuf I askes myself if you can use different types for the basic_streambuf like double. Are there any experiences and use cases here?
You're missing the point of streambuf. It's the back end of std::stream. The front end is provided by operator<< and operator>>. Those are overloaded for double. The frond end converts any type to characters, the back end does the I/O (to file, screen, network, whatever)
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I've tried searching for the answer, but nothing mentions stringstream specifically. I would guess that it would always work and you can always go back as far as the beginning of the underlying string.
Am I right?
How likely is istream::ungetc() to work with a stringbuf (as used in stringstream)?
Well, never.
There's no such thing like istream::ungetc() defined from the standard.
You can use either
int std::ungetc( int ch, std::FILE *stream )
or
std::basic_istream& std::basic_istream::unget()
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I'm new to C++ and wanted to do the following thing: consider a txt file that looks like this for example:
+-+-+-+-+
+-+-o-+-o
+-o-+-+-+
+-+-+-+-+
Now I want to take the content of this file and copy it into an array of the same size and do the other thing around aswell. Thank you for your help, explaining your answer would be extra amazing :)
Using build-in arrays for variable sized things is a bit tricky. The easy way is to use a suitable std::vector<char> instead:
std::ifstream in(from_filename);
std::vector<char> array{std::istreambuf_iterator<char>(in),
std::istreambuf_iterator<char>()};
// ...
std::ofstream out(to_filename);
std::copy(array.begin(), array.end(),
std::ostreambuf_iterator<char>(out));
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I am writing a console application in c++, but the input isn't working. I thought the way to get input in c++ was cin.get() but apparently not, because it isn't working. Or maybe there is a different way in Win32, I have no idea.
I am so confused, can someone please help? Thanks in advance!
You can obtain the input by using cin >> variable
for example.
string str;
cin >> str;