Code is really simple: ifstream datafile "data. Improve this question. BarsMonster BarsMonster 6, 2 2 gold badges 30 30 silver badges 47 47 bronze badges. Add a comment. Active Oldest Votes. It appeared that you can reach maximum SSD reading speed even with ifstream. Setting ifstream internal buffer: ifstream datafile "base. Improve this answer. I see the following options, in order of increasing performance: std::ifstream : read , etc. C : fopen , fread , etc.
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Featured on Meta. Opt-in alpha test for a new Stacks editor. Visual design changes to the review queues. Kernel buffers, disk buffers, and the like will also have an effect. Inspecting and changing those are system-dependent. This isn't going to try and be a complete tutorial on reading and writing binary files because "binary" covers a lot of ground , but we will try and clear up a couple of misconceptions and common errors.
First, ios::binary has exactly one defined effect, no more and no less. There are other things that normal mode does, but that's the most obvious. Why not? Because ifstream and ofstream exist for the purpose of formatting , not reading and writing.
This may or may not be what you want, see below. Notice how all the problems here are due to the inappropriate use of formatting functions and classes to perform something which requires that formatting not be done?
There are a seemingly infinite number of solutions, and a few are listed here:. How to go about using streambufs is a bit beyond the scope of this document at least for now , but while streambufs go a long way, they still leave a couple of things up to you, the programmer.
As an example, byte ordering is completely between you and the operating system, and you have to handle it yourself. Deriving a streambuf or filebuf class from the standard ones, one that is specific to your data types or an abstraction thereof is probably a good idea, and lots of examples exist in journals and on Usenet. Using the standard filebufs directly either by declaring your own or by using the pointer returned from an fstream's rdbuf is certainly feasible as well. One area that causes problems is trying to do bit-by-bit operations with filebufs.
If you're trying to read or write a few bits at a time, you're going about it the wrong way. Another area of problems is opening text files in binary mode. Generally, binary mode is intended for binary files, and opening text files in binary mode means that you now have to deal with all of those end-of-line and end-of-file problems that we mentioned before. An instructive thread from comp.
You'll have to sort through some flames every couple of paragraphs, but the points made are good ones. An example of their use is in the Received Wisdom section for Chapter 21 Strings , describing how to format strings. The quick definition is: they are siblings of ifstream and ofstream, and they do for std::string what their siblings do for files.
Need to format a string before passing the string to a function? You've read a string as input and need to parse it? Have a stringstream and need to get a copy of the string inside? Just call the str member function. If you are a user of the strstream classes, you need to update your code.
You don't have to explicitly append ends to terminate the C-style character array, you don't have to mess with "freezing" functions, and you don't have to manage the memory yourself. Both are published by Addison-Wesley, who isn't paying us a cent for saying that, honest. It transforms everything sent through it to uppercase. This version assumes many things about the nature of the character type being used for more information, read the books or the newsgroups :. Try it yourself! More examples can be found in 3.
Briefly, the problems of byte ordering and type sizes mean that the unformatted functions like ostream::put and istream::get cannot safely be used to communicate between arbitrary programs, or across a network, or from one invocation of a program to another invocation of the same program on a different platform, etc. The entire Usenet thread is instructive, and took place under the subject heading "binary iostreams" on both comp. It sounds like a flame on C, but it isn't. Calm down. I'm just saying it to get your attention.
For example:. Alert members of the audience will immediately notice that buffering is going to make a hash of the output unless special steps are taken. This kind of thing is tricky to get right. The upside is that correctness is ensured. Some patches have been applied which improve the situation for 3. The right thing to do in this case is to call. For GCC 3. Note, by the way, that the synchronization requirement only applies to the standard streams cin , cout , cerr , clog , and their wide-character counterparts.
File stream objects that you declare yourself have no such requirement and are fully buffered. If you have not read them, please do so first. A generic locking mechanism is somewhat in place at the filebuf layer, but is not used in the current code. Providing locking at any higher level is akin to providing locking within containers, and is not done for the same reasons see the links above.
We do no locking ourselves, but simply pass through to calls to fopen , fwrite , and so forth. So, for 3. You, the programmer, are always required to take care with multiple threads. However, you still need to not do stupid things like calling fclose fs in one thread followed by an access of fs in another. For higher-level operations, such as manipulating the data contained in the stream formatting classes e. This is disabled by default, and in fact will not currently work due to other issues.
It will be revisited, however. The real situation is more complex than that The result is that there is no "layer" of C stdio to go through; the filebuf makes calls directly into the same functions used to implement fread , fwrite , and so forth, using internal data structures. And when I say "makes calls directly," I mean the function is literally replaced by a jump into an internal function.
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