dlib示例，测试版本失败

Question

运行ubuntu 12.04，我下载了源代码并按照说明进行了编译（请参阅https://github.com/davisking/dlib）。以下是显示的错误消息。

cmake --build . --config Release 
[ 1%] Building CXX object dlib_build/CMakeFiles/dlib.dir/bsp/bsp.cpp.o 
In file included from /home/andreif/downlib/dlib-19.2/dlib/bsp/../sockets/../threads/parallel_for_extension.h:9:0, 
from /home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads.h:24, 
from /home/my_path/dlib-19.2/dlib/bsp/../sockets/sockets_kernel_2.h:33, 
from /home/my_path/dlib-19.2/dlib/bsp/../sockets/posix.h:4, 
from /home/my_path/dlib-19.2/dlib/bsp/../sockets.h:14, 
from /home/my_path/dlib-19.2/dlib/bsp/bsp.h:7, 
from /home/my_path/dlib-19.2/dlib/bsp/bsp.cpp:6: 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h: In function ‘std::future<typename std::result_of<_Functor(_ArgTypes="" ...)="">::type> dlib::async(dlib::thread_pool&, Function&&, Args&& ...)’: 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:63:15: error: expected nested-name-specifier before ‘bind_t’ 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:63:15: error: ‘bind_t’ has not been declared 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:63:22: error: expected ‘;’ before ‘=’ token 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:63:22: error: expected primary-expression before ‘=’ token 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:63:24: error: expected primary-expression before ‘decltype’ 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:63:24: error: expected ‘;’ before ‘decltype’ 
/home/my_path/dlib-19.2/dlib/bsp/../sockets/../threads/async.h:64:37: error: ‘bind_t’ was not declared in this scope 
make[2]: [dlib_build/CMakeFiles/dlib.dir/bsp/bsp.cpp.o] Error 1 
make[1]: [dlib_build/CMakeFiles/dlib.dir/all] Error 2 
make: *** [all] Error 2 

Answer 1

问题是我的C++编译器：在Ubuntu 12.04默认的gcc 4.6有C++ 11的支持，但它调用它时要在命令行启用。我尝试编辑/.bashrc来自动执行此操作，但它不起作用。对我来说，解决方案是安装GCC/G ++ 4.8（和使用更新的替代品，以保持旧的安装使用），因为这里

http://mortenvp.com/installing-a-newer-gccg-on-ubuntu-12-04-lts/