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Commit 86c6260

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overloading: C++
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‎book/cite.bib‎

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@@ -577,4 +577,13 @@ @online{2013-manura
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url = {http://lua-users.org/wiki/TypeIntrospection},
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urldate = {Apr 6, 2013},
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organization = {http://lua-users.org},
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}
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@online{2009-bailey,
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author = {CB Bailey},
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title = {Overloading a method in a subclass in C++},
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year = {2009},
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url = {https://stackoverflow.com/a/1734905},
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urldate = {Oct 6, 2009},
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organization = {stackoverflow.com},
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}

‎book/polymorphism.tex‎

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@@ -242,9 +242,9 @@ \subsection{C++}
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\lstinputlisting[language={[KB]C++}, linerange={76-76}, style=codeStyle]{../codes/cpp/polymorphism/type_manip.cpp}
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There are two types of cast: at compilation time (\keyword[C++]{static\_cast}) or at runtime (\keyword[C++]{dynamic\_cast}).
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There are two types of down-casting (among others): \keyword[C++]{static\_cast} and \keyword[C++]{dynamic\_cast}.
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Using the first one, type check is performed during compilation.
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The dynamic cast check types at runtime and return \keyword[C++]{NULL} in case of pointers, or throw an exception in case of references.
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The dynamic cast checks types at runtime and return \keyword[C++]{NULL} in case of pointers, or throw an exception in case of references.
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\lstinputlisting[language={[KB]C++}, linerange={83-87}, style=codeStyle]{../codes/cpp/polymorphism/type_manip.cpp}
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\section{Methods overloading}
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It is the feature of a class having multiple methods defined by the same identifier and different parameters.
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Statically-typed programming languages are, usually, the ones affording methods overloading since they enforce type checking during function calls.
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In this section, we will verify these properties:
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\begin{itemize}
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\item If the programming language supports methods overloading.
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If not, how to afford something similar.
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\item If we can overload methods over inheritance
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\end{itemize}
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\subsection{C++}
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In C++, overloading is permitted in the same class
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\lstinputlisting[language={[KB]C++}, linerange={4-8,16-18,22-23,31-32}, style=codeStyle]{../codes/cpp/polymorphism/overloading.cpp}
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When the same method is overloaded in a subclass, the new definition will hide those of the parent class;
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if they are called, this will generate a compilation error.
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To call them, there are two ways: import them using \keyword[C++]{using} declaration, or by calling them explicitly \citep{2009-bailey}.
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\lstinputlisting[language={[KB]C++}, linerange={10-17,19-19,26-32}, style=codeStyle]{../codes/cpp/polymorphism/overloading.cpp}
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\section{Methods overriding}
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#include <iostream>
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#include <string>
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class Person {
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public:
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void read(){ std::cout << "I am a reading" << std::endl; }
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void read(std::string text){ std::cout << "A text: " << text << std::endl; }
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};
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class Student: public Person {
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public:
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using Person::read;
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void read(int nbr){ std::cout << "I read on table n°: " << nbr << std::endl; }
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};
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int main()
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{
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Person pe;
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Student st;
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std::cout << "PERSON" << std::endl;
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pe.read();
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pe.read("I am a person");
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std::cout << "STUDENT" << std::endl;
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st.read(); // using Person::read; or error
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st.Person::read(); // Without using Person::read;
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st.read("I am a student"); // using Person::read; or error
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st.read(5);
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return 0;
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}

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