0
votes

I am trying to learn C++, and I cant seem to get threading to work.

#include <iostream>  
#include <thread>  
using namespace std;  

void thing(){  
    cout << "1 is a thing" << endl;  
    int num;
    cin >> num;
}  

int main(){  
    cout << "is 1 a thing?" << endl;  
    thread neat1(thing);  
    return 0;
}  

identifier "thread" is undefined
Im on C++14

minGW info:
Using built-in specs. COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/mingw32/8.2.0/lto-wrapper.exe
Target: mingw32
Configured with: ../src/gcc-8.2.0/configure --build=x86_64-pc-linux-gnu --host=mingw32 --target=mingw32 --prefix=/mingw --disable-win32-registry --with-arch=i586 --with-tune=generic --enable-languages=c,c++,objc,obj- c++,fortran,ada --with-pkgversion='MinGW.org GCC-8.2.0-3' --with-gmp=/mingw --with-mpfr=/mingw --with-mpc=/mingw --enable-static --enable-shared --enable-threads --with-dwarf2 --disable-sjlj-exceptions --enable-version- specific-runtime-libs --with-libiconv-prefix=/mingw --with-libintl- prefix=/mingw --enable-libstdcxx-debug --with-isl=/mingw --enable-libgomp --disable-libvtv --enable-nls --disable-build-format-warnings
Thread model: win32
gcc version 8.2.0 (MinGW.org GCC-8.2.0-3)

this is what happends if I compile via cmd

>g++ first.cpp -std=c++11  
first.cpp: In function 'int main()':  
first.cpp:13:5: error: 'thread' was not declared in this scope  
     thread neat1(thing);  
     ^~~~~~  
first.cpp:13:5: note: 'std::thread' is defined in header '<thread>'; did you   forget to '#include <thread>'?  
first.cpp:3:1:  
+#include <thread>  
 using namespace std;  
first.cpp:13:5:  
     thread neat1(thing);  
     ^~~~~~
1
Check if you're using at least C++11. - João Paulo
1) main(){ should be int main(){ 2) Are you compiling with C++-11 enabled? - Algirdas Preidžius
What is your compiler version and how do you compile (options used for compilation)? - Yksisarvinen
Im using minGW and by options do you mean the .json's? (sorry as you can tell, I'm very new to alot of this) - yes
What version? I don't think the 32 bit version supports thread - NathanOliver

1 Answers

0
votes

My compiler turned out to be the issue, so I removed the old one and got a new MinGW compiler from https://sourceforge.net/projects/mingw-w64/files/ from the online installer. After setting that up threading worked.