Converting an int to std string

Question

What is the shortest way  preferably inline-able  to convert an int to a string  Answers using stl and boost will be welcomed

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Suppose I have integer   0123456789101112   Now  this integer can be converted into a string by the stringstream class   Here is the code in C         include  lt bits stdc   h gt     using namespace std     int main              int n i        string s        stringstream st        for i 0 i lt  12 i                    st lt  lt i                s st str          cout lt  lt s lt  lt endl        return 0

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If you cannot use std  to string from C  11  you can write it as it is defined on cppreference com      std  string to string  int value     Converts a signed decimal integer to a string with the same content as what std  sprintf buf    d   value  would produce for sufficiently large buf    Implementation   include  lt cstdio gt   include  lt string gt   include  lt cassert gt   std  string to string  int x       int length   snprintf  NULL  0    d   x      assert  length  gt   0      char  buf   new char length   1     snprintf  buf  length   1    d   x      std  string str  buf      delete   buf    return str      You can do more with it  Just use   g  to convert float or double to string  use   x  to convert int to hex representation  and so on

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Non-standard function  but its implemented on most common compilers   int input   MY VALUE  char buffer 100     0   int number base   10  std  string output   itoa input  buffer  number base     Update  C  11 introduced several std  to string overloads  note that it defaults to base-10

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The following macro is not quite as compact as a single-use ostringstream or boost  lexical cast   But if you need conversion-to-string repeatedly in your code  this macro is more elegant in use than directly handling stringstreams or explicit casting every time   It is also very versatile  as it converts everything supported by operator lt  lt     even in combination   Definition    include  lt sstream gt    define SSTR  x   dynamic cast lt  std  ostringstream  amp   gt                   std  ostringstream    lt  lt  std  dec  lt  lt  x     str     Explanation   The std  dec is a side-effect-free way to make the anonymous ostringstream into a generic ostream so operator lt  lt    function lookup works correctly for all types   You get into trouble otherwise if the first argument is a pointer type    The dynamic cast returns the type back to ostringstream so you can call str   on it   Use    include  lt string gt   int main         int i   42      std  string s1   SSTR  i         int x   23      std  string s2   SSTR   i     lt  lt  i  lt  lt     x     lt  lt  x        return 0

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Well the well known way to do that is using the stream operator     include  lt sstream gt   std  ostringstream s  int i   s  lt  lt  i   std  string converted s str       Of course you can generalize it for any type using a template function      include  lt sstream gt   template lt typename T gt  std  string toString const T amp  value        std  ostringstream oss      oss  lt  lt  value      return oss str

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You can use std  to string in C  11  int i   3  std  string str   std  to string i

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boost  lexical cast lt std  string gt  yourint  from boost lexical cast hpp  Work s for everything with std  ostream support  but is not as fast as  for example  itoa  It even appears to be faster than stringstream or scanf      http   www boost org doc libs 1 53 0 doc html boost lexical cast performance html

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include  lt string gt   include  lt stdlib h gt    Here  is another easy way to convert int to string  int n   random 65 90   std  string str1    String  createWithFormat   c  n - gt getCString       you may visit this link for more methods https   www geeksforgeeks org what-is-the-best-way-in-c-to-convert-a-number-to-a-string

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You might include the implementation of itoa in your project  Here s itoa modified to work with std  string  http   www strudel org uk itoa

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You can use this function to convert int to std  string after including  lt sstream gt     include  lt sstream gt   string IntToString  int a        stringstream temp      temp lt  lt a      return temp str

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include  lt sstream gt   include  lt string gt  const int i   3  std  ostringstream s  s  lt  lt  i  const std  string i as string s str

[c++] Converting an int to std::string

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