Answered: Developers can instantiate a Volunteer…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

1) Developers can instantiate a Volunteer object using any of its three constructors. Write the function declaration of the constructor called on the first row of the Object instantiation table? The concept of providing multiple constructors and the ability to choose which one to use is called constructor overloading. 2) Which instantiation uses the copy constructor? Provide the row number from the Object instantiation table. 3) How do you think the compiler knows which constructor it should call? Place a check (v) beside your answer. -It checks the name of the member function that was called. -It compares the number of arguments and their data types with the constructor's parameters. -It always calls the overload with the least number of parameters.

Object Instantiation
# Instantiation
1 Volunteer tuffy{};
2
Volunteer titan{"Titan",
"CSUF" };
3 Volunteer clone {tuffy};
Member function call
Member function call
tuffy.Request Food ("Milk",
2);
Food f("Milk", 2);
tuffy.Request Food (f);
Volunteer constructor
Volunteer (): name_{""},
branch_{"CSU Fullerton"} { }
Volunteer (const std::string & name,
const std::string& branch)
: name_{name}, branch_{branch} { }
Volunteer (const Volunteer& other)
: name_{other.Name () },
branch_{other.Branch () } { }
Member function
void Request Food (const std::string & name,
int quantity);
void Request Food (const Food& f);

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