411 REFERENCE · Wikibooks
C++ Language/Objects/Constructors/InitializationByCopyConstructor
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
"Implicit initialization" (CRType oImp = oCopied;) and "explicit initialization" (CRType oExp(oCopied);) are equivalent in the sense that they both invoke CRType's "copy-constructor".
The copy-constructor's signature is CRType::CRType(const CRType& aroCopied).
This same copy-constructor will also be called whenever an object is passed-by-value into some function.
Additional information about copy-constructors (includes interactive examples)