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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Stream (computing)</span></span>
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</style><div role="note" class="hatnote navigation-not-searchable">For related concepts, see <a href="Stream_(abstract_data_type)" title="Stream (abstract data type)">Stream (abstract data type)</a>, <a href="Data_stream" title="Data stream">Data stream</a>, <a href="Bitstream" title="Bitstream">Bitstream</a>, and <a href="STREAMS" title="STREAMS">STREAMS</a>.</div>
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<p>In <a href="Computer_science" title="Computer science">computer science</a>, a <b>stream</b> is a <a href="Sequence" title="Sequence">sequence</a> of potentially unlimited <a href="Data_element" title="Data element">data elements</a> made available over time. A stream can be thought of as items on a <a href="Conveyor_belt" title="Conveyor belt">conveyor belt</a> being processed one at a time rather than in large batches. Streams are processed differently from <a href="Batch_processing" title="Batch processing">batch data</a>.
</p><p>Normal functions cannot operate on streams as a whole because they have potentially unlimited data. Formally, streams are <i><a href="Codata_(computer_science)" class="mw-redirect" title="Codata (computer science)">codata</a></i> (potentially unlimited), not data (which is finite).
</p><p>Functions that operate on a stream producing another stream are known as <a href="Filter_(software)" title="Filter (software)">filters</a> and can be connected in <a href="Pipeline_(computing)" title="Pipeline (computing)">pipelines</a> in a manner analogous to <a href="Function_composition_(computer_science)" title="Function composition (computer science)">function composition</a>. Filters may operate on one item of a stream at a time or may base an item of output on multiple items of input such as a <a href="Moving_average" title="Moving average">moving average</a>.
</p>
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<div class="mw-heading mw-heading2"><h2 id="Examples">Examples</h2></div>
<p>The term "stream" is used in a number of similar ways:
</p>
<ul><li>"Stream editing", as with <a href="Sed" title="Sed">sed</a>, <a href="Awk" class="mw-redirect" title="Awk">awk</a>, and <a href="Perl" title="Perl">perl</a>. Stream editing processes a file or files, in-place, without having to load the file(s) into a user interface. One example of such use is to do a search and replace on all the files in a directory, from the command line.</li>
<li>On <a href="Unix" title="Unix">Unix</a> and related systems based on the <a href="C_(programming_language)" title="C (programming language)">C language</a>, a stream is a source or <a href="Sink_(computing)" title="Sink (computing)">sink</a> of data, usually individual bytes or <a href="Character_(computing)" title="Character (computing)">characters</a>. Streams are an abstraction used when reading or writing files, or communicating over <a href="Network_socket" title="Network socket">network sockets</a>. The <a href="Standard_streams" title="Standard streams">standard streams</a> are three streams made available to all programs.</li>
<li>I/O devices can be interpreted as streams, as they produce or consume potentially unlimited data over time.</li>
<li>In <a href="Object-oriented_programming" title="Object-oriented programming">object-oriented programming</a>, input streams are generally implemented as <a href="Iterator" title="Iterator">iterators</a>.</li>
<li>In the <a href="Scheme_(programming_language)" title="Scheme (programming language)">Scheme language</a> and some others, a stream is a <a href="Lazy_evaluation" title="Lazy evaluation">lazily evaluated</a> or <i>delayed</i> sequence of data elements. A stream can be used similarly to a list, but later elements are only calculated when needed. Streams can therefore represent infinite <a href="Sequence" title="Sequence">sequences</a> and <a href="Series_(mathematics)" title="Series (mathematics)">series</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li>
<li>In the <a href="Smalltalk" title="Smalltalk">Smalltalk</a> <a href="Standard_library" title="Standard library">standard library</a> and in other <a href="Programming_language" title="Programming language">programming languages</a> as well, a stream is an <a href="External_iterator" class="mw-redirect" title="External iterator">external iterator</a>. As in Scheme, streams can represent finite or infinite sequences.</li>
<li><a href="Stream_processing" title="Stream processing">Stream processing</a> — in <a href="Parallel_computing" title="Parallel computing">parallel processing</a>, especially in graphic processing, the term stream is applied to <a href="Computer_hardware" title="Computer hardware">hardware</a> as well as <a href="Software" title="Software">software</a>. There it defines the quasi-continuous flow of data that is processed in a <a href="Dataflow_programming" title="Dataflow programming">dataflow programming</a> language as soon as the <a href="Program_state" class="mw-redirect" title="Program state">program state</a> meets the starting condition of the stream.</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Applications">Applications</h2></div>
<p>Streams can be used as the underlying data type for <a href="Channel_(programming)" title="Channel (programming)">channels</a> in <a href="Interprocess_communication" class="mw-redirect" title="Interprocess communication">interprocess communication</a>.
</p>
<div class="mw-heading mw-heading2"><h2 id="Other_uses">Other uses</h2></div>
<p>The term "stream" is also applied to <a href="File_system" title="File system">file system</a> <i><a href="Fork_(file_system)" title="Fork (file system)">forks</a></i>, where multiple sets of data are associated with a single filename. Most often, there is one main stream that makes up the normal file data, while additional streams contain <a href="Metadata_Encoding_and_Transmission_Standard" title="Metadata Encoding and Transmission Standard">metadata</a>. Here "stream" is used to indicate "variable size data", as opposed to fixed size metadata such as <a href="Extended_file_attributes" title="Extended file attributes">extended attributes</a>, but differs from "stream" as used otherwise, meaning "data available over time, potentially infinite".
</p>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Bitstream" title="Bitstream">Bitstream</a></li>
<li><a href="Codata_(computer_science)" class="mw-redirect" title="Codata (computer science)">Codata</a></li>
<li><a href="Data_stream" title="Data stream">Data stream</a></li>
<li><a href="Data_stream_mining" title="Data stream mining">Data stream mining</a></li>
<li><a href="Traffic_flow_(computer_networking)" title="Traffic flow (computer networking)">Traffic flow (computer networking)</a></li>
<li><a href="Network_socket" title="Network socket">Network socket</a></li>
<li><a href="Streaming_algorithm" title="Streaming algorithm">Streaming algorithm</a></li>
<li><a href="Streaming_media" title="Streaming media">Streaming media</a></li>
<li><a href="Stream_processing" title="Stream processing">Stream processing</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
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<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="http://srfi.schemers.org/srfi-41/srfi-41.html">SRFI 41: Streams</a></span>
</li>
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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="http://portal.acm.org/citation.cfm?id=796530">An Approximate L1-Difference Algorithm for Massive Data Streams, 1995 Feigenbaum et al.</a></li></ul>
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<ul><li><a href="Bit" title="Bit">Bit</a></li>
<li><a href="Byte" title="Byte">Byte</a></li>
<li><a href="Ternary_numeral_system" title="Ternary numeral system">Trit</a></li>
<li><a href="Ternary_numeral_system#Tryte" title="Ternary numeral system">Tryte</a></li>
<li><a href="Word_(computer_architecture)" title="Word (computer architecture)">Word</a></li>
<li><a href="Bit_array" title="Bit array">Bit array</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Numeric</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Arbitrary-precision_arithmetic" title="Arbitrary-precision arithmetic">Arbitrary-precision or bignum</a></li>
<li><a href="Complex_data_type" title="Complex data type">Complex</a></li>
<li><a href="Decimal_data_type" title="Decimal data type">Decimal</a></li>
<li><a href="Fixed-point_arithmetic" title="Fixed-point arithmetic">Fixed point</a></li>
<li><a href="Block_floating_point" title="Block floating point">Block floating point</a></li>
<li><a href="Floating-point_arithmetic" title="Floating-point arithmetic">Floating point</a>
<ul><li>Reduced precision
<ul><li><a href="Minifloat" title="Minifloat">Minifloat</a></li>
<li><a href="Half-precision_floating-point_format" title="Half-precision floating-point format">Half precision</a></li>
<li><a href="Bfloat16_floating-point_format" title="Bfloat16 floating-point format">bfloat16</a></li></ul></li>
<li><a href="Single-precision_floating-point_format" title="Single-precision floating-point format">Single precision</a></li>
<li><a href="Double-precision_floating-point_format" title="Double-precision floating-point format">Double precision</a></li>
<li><a href="Quadruple-precision_floating-point_format" title="Quadruple-precision floating-point format">Quadruple precision</a></li>
<li><a href="Octuple-precision_floating-point_format" title="Octuple-precision floating-point format">Octuple precision</a></li>
<li><a href="Extended_precision" title="Extended precision">Extended precision</a>
<ul><li><a href="Long_double" title="Long double">Long double</a></li></ul></li></ul></li>
<li><a href="Integer_(computer_science)" title="Integer (computer science)">Integer</a>
<ul><li><a href="Signedness" title="Signedness">signedness</a></li></ul></li>
<li><a href="Interval_arithmetic#Implementations" title="Interval arithmetic">Interval</a></li>
<li><a href="Rational_data_type" title="Rational data type">Rational</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Pointer_(computer_programming)" title="Pointer (computer programming)">Pointer</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Memory_address" title="Memory address">Address</a>
<ul><li><a href="Physical_address" title="Physical address">physical</a></li>
<li><a href="Virtual_address_space" title="Virtual address space">virtual</a></li></ul></li>
<li><a href="Reference_(computer_science)" title="Reference (computer science)">Reference</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Plain_text" title="Plain text">Text</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Character_(computing)" title="Character (computing)">Character</a></li>
<li><a href="String_(computer_science)" title="String (computer science)">String</a>
<ul><li><a href="Null-terminated_string" title="Null-terminated string">null-terminated</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="Composite_data_type" title="Composite data type">Composite</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Algebraic_data_type" title="Algebraic data type">Algebraic data type</a>
<ul><li><a href="Generalized_algebraic_data_type" title="Generalized algebraic data type">generalized</a></li></ul></li>
<li><a href="Array_(data_type)" title="Array (data type)">Array</a></li>
<li><a href="Associative_array" title="Associative array">Associative array</a></li>
<li><a href="Class_(computer_programming)" title="Class (computer programming)">Class</a></li>
<li><a href="Dependent_type" title="Dependent type">Dependent</a></li>
<li><a href="Intuitionistic_type_theory#Equality_type" title="Intuitionistic type theory">Equality</a></li>
<li><a href="Inductive_type" title="Inductive type">Inductive</a></li>
<li><a href="Intersection_type" title="Intersection type">Intersection</a></li>
<li><a href="List_(abstract_data_type)" title="List (abstract data type)">List</a></li>
<li><a href="Object_(computer_science)" title="Object (computer science)">Object</a>
<ul><li><a href="Metaobject" title="Metaobject">metaobject</a></li></ul></li>
<li><a href="Option_type" title="Option type">Option type</a></li>
<li><a href="Product_type" title="Product type">Product</a></li>
<li><a href="Record_(computer_science)" title="Record (computer science)">Record or Struct</a></li>
<li><a href="Refinement_type" title="Refinement type">Refinement</a></li>
<li><a href="Set_(abstract_data_type)" title="Set (abstract data type)">Set</a></li>
<li><a href="Union_type" title="Union type">Union</a>
<ul><li><a href="Tagged_union" title="Tagged union">tagged</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Boolean_data_type" title="Boolean data type">Boolean</a></li>
<li><a href="Bottom_type" title="Bottom type">Bottom type</a></li>
<li><a href="Container_(abstract_data_type)" title="Container (abstract data type)">Collection</a></li>
<li><a href="Enumerated_type" title="Enumerated type">Enumerated type</a></li>
<li><a href="Exception_handling" title="Exception handling">Exception</a></li>
<li><a href="Function_type" title="Function type">Function type</a></li>
<li><a href="Opaque_data_type" title="Opaque data type">Opaque data type</a></li>
<li><a href="Recursive_data_type" title="Recursive data type">Recursive data type</a></li>
<li><a href="Semaphore_(programming)" title="Semaphore (programming)">Semaphore</a></li>
<li><a href="Strongly_typed_identifier" title="Strongly typed identifier">Strongly typed identifier</a></li>
<li><a href="Top_type" class="mw-redirect" title="Top type">Top type</a></li>
<li><a href="Type_class" title="Type class">Type class</a></li>
<li><a href="Empty_type" title="Empty type">Empty type</a></li>
<li><a href="Unit_type" title="Unit type">Unit type</a></li>
<li><a href="Void_type" title="Void type">Void</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related<br>topics</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em">
<ul><li><a href="Abstract_data_type" title="Abstract data type">Abstract data type</a></li>
<li><a href="Boxing_(computer_programming)" title="Boxing (computer programming)">Boxing</a></li>
<li><a href="Data_structure" title="Data structure">Data structure</a></li>
<li><a href="Generic_programming" title="Generic programming">Generic</a></li>
<li><a href="Kind_(type_theory)" title="Kind (type theory)">Kind</a>
<ul><li><a href="Metaclass" title="Metaclass">metaclass</a></li></ul></li>
<li><a href="Parametric_polymorphism" title="Parametric polymorphism">Parametric polymorphism</a></li>
<li><a href="Primitive_data_type" title="Primitive data type">Primitive data type</a></li>
<li><a href="Interface_(object-oriented_programming)" title="Interface (object-oriented programming)">Interface</a></li>
<li><a href="Subtyping" title="Subtyping">Subtyping</a></li>
<li><a href="Type_constructor" title="Type constructor">Type constructor</a></li>
<li><a href="Type_conversion" title="Type conversion">Type conversion</a></li>
<li><a href="Type_system" title="Type system">Type system</a></li>
<li><a href="Type_theory" title="Type theory">Type theory</a></li>
<li><a href="Variable_(computer_science)" title="Variable (computer science)">Variable</a></li></ul>
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