to string is not a member of std says g mingw

Question

I am making a small vocabulary remembering program where words would would be flashed at me randomly for meanings  I want to use standard C   library as Bjarne Stroustroup tells us  but I have encountered a seemingly strange problem right out of the gate    I want to change a long integer into std  string so as to be able to store it in a file  I have employed to string   for the same  The problem is  when I compile it with g    version 4 7 0 as mentioned in its -- version flag   it says   PS C  Users Anurag SkyDrive College Programs gt  g   -std c  0x ttd cpp ttd cpp  In function  int main     ttd cpp 11 2  error   to string  is not a member of  std    My program that gives this error is    include  lt string gt   int main         std  to string 0       return 0      But  I know it can t be because msdn library clearly says it exists and an earlier question on Stack Overflow  for g   version 4 5  says that it can be turned on with the -std c  0x flag  What am I doing wrong

User · Answer

to string   is only present in c  11 so if c   version is less use some alternate methods such as sprintf or ostringstream

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include  lt string gt   include  lt sstream gt   namespace patch       template  lt  typename T  gt  std  string to string  const T amp  n                 std  ostringstream stm           stm  lt  lt  n           return stm str               include  lt iostream gt   int main         std  cout  lt  lt  patch  to string 1234   lt  lt    n   lt  lt  patch  to string 1234 56   lt  lt    n        do not forget to include  include  lt sstream gt

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to string is a current issue with Cygwin  Here s a new-ish answer to an old thread  A new one did come up but was quickly quashed   Cygwin  g   5 2     to string    is not a member of    std       Too bad  maybe we would have gotten an updated answer  According to  Alex  Cygwin g   5 2 is still not working as of November 3  2015    On January 16  2015 Corinna Vinschen  a Cygwin maintainer at Red Hat said the problem was a shortcoming of newlib  It doesn t support most long double functions and is therefore not C99 aware    Red Hat is           still hoping to get the  long double  functionality into newlib at   one point    On October 25  2015 Corrine also said       It would still be nice if somebody with a bit of math knowledge would   contribute the missing long double functions to newlib    So there we have it  Maybe one of us who has the knowledge  and the time  can contribute and be the hero   Newlib is here

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If we use a template-light-solution  as shown above  like the following   namespace std       template lt typename T gt      std  string to string const T  amp n            std  ostringstream s          s  lt  lt  n          return s str              Unfortunately  we will have problems in some cases  For example  for static const members   hpp  class A   public       static const std  size t x   10       A         cpp  A  A         std  cout  lt  lt  std  to string x       And linking   CMakeFiles untitled2 dir a cpp o a cpp   rdata  refptr  ZN1A1xE  refptr  ZN1A1xE  0x0   undefined reference to  A  x  collect2  error  ld returned 1 exit status   Here is one way to solve the problem  add to the type size t    namespace std       std  string to string size t n            std  ostringstream s          s  lt  lt  n          return s str              HTH

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As suggested this may be an issue with your compiler version   Try using the following code to convert a long to std  string    include  lt sstream gt   include  lt string gt   include  lt iostream gt   int main         std  ostringstream ss      long num   123456      ss  lt  lt  num      std  cout  lt  lt  ss str    lt  lt  std  endl

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For anyone wondering why this happens on Android  it s probably because you re using a wrong c   standard library  Try changing the c   library in your build gradle from gnustl static to c   static and the c   standard in your CMakeLists txt from -std gnu  11 to -std c  11

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The fact is that libstdc   actually supported std  to string in  -w64-mingw32 targets since 4 8 0  However  this does not include support for MinGW org  Cygwin and variants  e g   -pc-msys from MSYS2   See also https   cygwin com ml cygwin 2015-01 msg00245 html   I have implemented a workaround before the bug resolved for MinGW-w64  Being different to code in other answers  this is a mimic to libstdc    as possible   It does not require string stream construction but depends on libstdc   extensions  Even now I am using mingw-w64 targets on Windows  it still works well for multiple other targets  as long as long double functions not being used

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Use this function          include lt sstream gt      template  lt typename T gt      std  string to string T value                create an output string stream       std  ostringstream os            throw the value into the string stream       os  lt  lt  value            convert the string stream into a string and return       return os str                  you can also do this       std  string output        os  gt  gt  output     throw whats in the string stream into the string

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For me  ensuring that I had   include  lt iostream gt     include lt string gt    using namespace std   in my file made something like to string 12345  work

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This is a known bug under MinGW  Relevant Bugzilla  In the comments section you can get a patch to make it work with MinGW   This issue has been fixed in MinGW-w64 distros higher than GCC 4 8 0 provided by the MinGW-w64 project  Despite the name  the project provides toolchains for 32-bit along with 64-bit  The Nuwen MinGW distro also solves this issue

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This happened to me as well  I just wrote up a quick function rather than worrying about updating my compiler    string to string int number       string number string           char ones char      int ones   0      while true           ones   number   10          switch ones               case 0  ones char    0   break              case 1  ones char    1   break              case 2  ones char    2   break              case 3  ones char    3   break              case 4  ones char    4   break              case 5  ones char    5   break              case 6  ones char    6   break              case 7  ones char    7   break              case 8  ones char    8   break              case 9  ones char    9   break              default   ErrorHandling  Trouble converting number to string                       number -  ones          number string   ones char   number string          if number    0               break                    number   number 10            return number string

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Change default C   standard   From  COMPILE FILE FAILED  error   to string  is not a member of  std      -std c  98   To  COMPILE FILE SUCCESSFUL      -std c  11 or -std c  14   Tested on Cygwin G   GCC  5 4 0

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in codeblocks go to setting -  compiler setting -  compiler flag -  select std c  11 done  I had the same problem     now it s working

[c++] to_string is not a member of std, says g++ (mingw)

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