C + + standard library concepts and common tools for libraries

The so-called namespace of the using namespace STD is a way to encapsulate the library name as if it were erected a fence in the library

Some of the standard libraries, such as string classes, support specific error handling, check for all possible errors, and throw exceptions when an error occurs. For other parts such as STL and valarrays, efficiency is more than security, so logic errors are rarely checked and exceptions are thrown only when the runtime has an exception.

The allocator class is a template for C + + that provides typed memory allocations and the allocation and revocation of objects.

Exit () destroys all the static objects, empties all buffers (flushes), closes all I/O channels, and then terminates the program.

Abort () terminates the function immediately, but does not do any clean up work.

C + + standard library concepts and common tools for libraries