Error during building an application c++ using api qgis 2.8

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i have an apllication that need an object

the object type is QgsSymbolV2

but i cannot do that :

QgsSymbolV2 * lSymbol = new QgsSymbolV2(); because in the class qgssymbolv2 there is no constructor it is a pure static class, but in the old version ( qgsi 1.6 by exemple ) the class qgissymbol has 3 types of constructor with different parameters and a default constructor

so my idea is to build my class CMyQgisSymbol by exemple in order to add some fonction that my application needs but my class must be instanciate by a new and must be based or herit of the qgssymbolv2 class

i try this code : in my header file :

class CMyQgsSymbol : public QgsSymbolV2 { public : CMyQgsSymbol(); ~CMyQgsSymbol(); }

in my source file :

lSymbol = new CMyQgsSymbol();

but when i build the code i have this error :

cannot allocate an object of abstract type

how can i proceed to create this object

thanks



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