C++ 20 Variant data/object type implementation

Variant data/object type with array suport implementation.

Current supported data types:

• bool;
• int;
• long;
• double;
• std::string;
• std::time_t;
• array.

Usage

Declaring var1 as Variant data type

lsvbs::Variant var1;

Using direct association:

var1 = 10;	// var1 assuming int data type
var1 = true;	// var1 assuming bool data type
var1 = 10L;	// var1 assuming long data type
var1 = 10.5;	// var1 assuming double data type
var1 = std::string(“testing”);	// var1 assuming string data type
var1 = std::time(0); 	// var1 assuming date and time data type;

Using Set and Get method:

var1.Set(10);	// var1 assuming int data type

double dblvar = 10.5;
var1.Set(dblvar);	// var1 assuming double data type

double dvar2;
dvar2 = var1.Get<double>();		// dvar2 now contains 10.5

Logic Operators

lsvbs::Variant bVar;
lsvbs::Variant v1;
lsvbs::Variant v2;

v1 = true;
v2 = false;

bVar = v1 && v2;
std::cout << "Logic Operator " + v1.ToString() + " AND " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 || v2;
std::cout << "Logic Operator " + v1.ToString() + " OR " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 ^ v2;
std::cout << "Logic Operator " + v1.ToString() + " XOR " + v2.ToString() + " = " + bVar.ToString() + "\r\n";  

output:

Logic Operator True AND False = False
Logic Operator True OR False = True
Logic Operator True XOR False = True

Comparation Operators

lsvbs::Variant bVar;
lsvbs::Variant v1;
lsvbs::Variant v2;

v1 = 10;
v2 = 100;
bVar = v1 > v2;

std::cout << "Compatarion " + v1.ToString() + " > " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 < v2;
std::cout << "Compatarion " + v1.ToString() + " < " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 >= v2;
std::cout << "Compatarion " + v1.ToString() + " >= " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 <= v2;
std::cout << "Compatarion " + v1.ToString() + " <= " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 == v2;
std::cout << "Compatarion " + v1.ToString() + " == " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

Output

Compatarion 10 > 100 = False
Compatarion 10 < 100 = True
Compatarion 10 >= 100 = False
Compatarion 10 <= 100 = True
Compatarion 10 == 100 = False

Aritimetic operations and string concatenation

lsvbs::Variant bVar;
lsvbs::Variant v1;
lsvbs::Variant v2;

v1 = 10;
v2 = 2;

bVar = v1 + v2;
std::cout << "Operation " + v1.ToString() + " + " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 - v2;
std::cout << "Operation " + v1.ToString() + " - " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 * v2;
std::cout << "Operation " + v1.ToString() + " * " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 / v2;
std::cout << "Operation " + v1.ToString() + " / " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

bVar = v1 % v2;
std::cout << "Operation " + v1.ToString() + " % " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

// perform string concatenation
v1 = std::string("Hey");
v2 = std::string("You");
bVar = v1 + " " + v2;
std::cout << "Concatenation " + v1.ToString() + " + ' ' + " + v2.ToString() + " = " + bVar.ToString() + "\r\n";

Output

Operation 10 + 2 = 12
Operation 10 - 2 = 8
Operation 10 * 2 = 20
Operation 10 / 2 = 5
Operation 10 % 2 = 0
Concatenation Hey + ' ' + You = Hey You

Array operations

lsvbs::Variant array;

array.Push(100);                                // 1
array.Push(true);                               // 2
array.Push(std::string("testing..."));          // 3

array.Pull(std::string("testing...again"));     // stil 3

array.Push(10.5);                               // 4

std::cout << "Size before POP: " + stringify(array.Count()) + "\r\n";
array.Pop();                                    // 3
std::cout << "Size after POP: " + stringify(array.Count()) + "\r\n";

std::cout << "Size before INSERT: " + stringify(array.Count()) + "\r\n";
array.Insert(1, time(0));                       // 4
std::cout << "Size after INSERT: " + stringify(array.Count()) + "\r\n";

for (int i = 0; i < array.Count(); i++)
{
	std::cout << "array[" + stringify(i) + "]: Type=" + array[i].TypeName() + " Value=" + array[i].ToString() + "\r\n";
}

Output

Size before POP: 4
Size after POP: 3
Size before INSERT: 3
Size after INSERT: 4
array[0]: Type=Integer Value=100
array[1]: Type=DateAndTime Value=30/08/2022T20:50:54
array[2]: Type=Boolean Value=True
array[3]: Type=String Value=testing...again

Meta

Dante Souto – @dantesouto

Distributed under the MIT license. See LICENSE for more information.

https://github.com/DanteSouto/