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what's the difference between abstract class and concreate
class? what's the meaning of standard template library(STL)?

Question Posted / dumitru

Answer Posted / dumitru

In C++ an abstract class is a class that contain at least
one pure virtual function ( f()=0; ) and is related at using
this only for inheritance, not for instance an object from
this directly.

The Standard Template Library, or STL, is a C++ library of
container classes, algorithms, and iterators; it provides
many of the basic algorithms and data structures of
computer science. The STL is a generic library, meaning
that its components are heavily parameterized: almost every
component in the STL is a template.

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