error make unique is not a member of std

Question

I am trying to compile the following thread pool program posted on code review to test it   https   codereview stackexchange com questions 55100 platform-independant-thread-pool-v4  But I am getting the errors  threadpool hpp  In member function    std  future lt decltype  task  forward lt Args gt   args       gt  threadpool  enqueue task Func amp  amp   Args amp  amp           threadpool hpp 94 28  error     make unique    was not declared in this scope      auto package ptr   make unique lt task package impl lt R  decltype bound task  gt  gt    std  move bound task   std  move promise                              threadpool hpp 94 81  error  expected primary-expression before     gt     token      auto package ptr   make unique lt task package impl lt R  decltype bound task  gt  gt  std  move bound task   std  move promise                                                                                   main cpp  In function    int main       main cpp 9 17  error     make unique    is not a member of    std     auto ptr1   std  make unique lt unsigned gt                    main cpp 9 34  error  expected primary-expression before    unsigned     auto ptr1   std  make unique lt unsigned gt                                     main cpp 14 17  error     make unique    is not a member of    std     auto ptr2   std  make unique lt unsigned gt                    main cpp 14 34  error  expected primary-expression before    unsigned     auto ptr2   std  make unique lt unsigned gt

User · Answer

This happens to me while working with XCode (I'm using the most current version of XCode in 2019...). I'm using, CMake for build integration. Using the following directive in CMakeLists.txt fixed it for me:

set(CMAKE_CXX_STANDARD 14).

Example:

cmake_minimum_required(VERSION 3.14.0)
set(CMAKE_CXX_STANDARD 14)

# Rest of your declarations...

User · Answer

If you have latest compiler  you can change the following in your build settings    C   Language Dialect    C  14 -std c  14    This works for me

User · Answer

1 gcc version    5 2 CXXFLAGS    -std c  14 3   include  lt memory gt

User · Answer

make unique is an upcoming C  14 feature and thus might not be available on your compiler  even if it is C  11 compliant   You can however easily roll your own implementation   template lt typename T  typename    Args gt  std  unique ptr lt T gt  make unique Args amp  amp     args        return std  unique ptr lt T gt  new T std  forward lt Args gt  args             FYI  here is the final version of make unique that was voted into C  14  This includes additional functions to cover arrays  but the general idea is still the same

User · Answer

In my case I was needed update the std c    I mean in my gradle file was this  android                defaultConfig                        externalNativeBuild               cmake                   cppFlags  -std c  11    -Wall                  arguments  -DANDROID STL c   static                            -DARCORE LIBPATH   arcore libpath  jni                            -DARCORE INCLUDE   project rootDir  app src main libs                                              I changed this line   android                defaultConfig                        externalNativeBuild               cmake                   cppFlags  -std c  17    -Wall     lt -- this number from 11 to 17  or 14                  arguments  -DANDROID STL c   static                            -DARCORE LIBPATH   arcore libpath  jni                            -DARCORE INCLUDE   project rootDir  app src main libs                                              That s it

User · Answer

If you are stuck with c  11  you can get make unique from abseil-cpp  an open source collection of C   libraries drawn from Google   s internal codebase

[c++] error::make_unique is not a member of ‘std’

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