Compilation failed! Errors found: * Exchange\Exchange.h(205,10) : error 265: 'ToString' - overriding virtual function with different return type * Platform\Platform.h(633,10) : error 265: 'ToString' - overriding virtual function with different return type * Exchange\Exchange.h(78,33) : error 383: 'AccountForex' - cannot instantiate abstract class * Exchange\Exchange.h(162,26) : error 383: 'AccountForex' - cannot instantiate abstract class * Exchange\Exchange.h(165,48) : error 383: 'AccountForex' - cannot instantiate abstract class