C++ Day 39 STL Containers (Deep Understanding & Real Usage) Till now, you already know arrays, vectors, loops, and STL algorithms. Today, we go one step deeper and understand STL containers , which are the backbone of modern C++ programming. In real projects and competitive coding, choice of container matters a lot. 1. What are STL Containers? STL containers are data structures provided by C++ to store data efficiently. They handle: memory management resizing element access performance optimization You focus on logic , not memory handling. 2. Categories of STL Containers STL containers are mainly divided into: Sequence Containers Associative Containers Unordered Containers Container Adapters 3. Sequence Containers These store data in sequence . 3.1 Vector Most used container in C++. vector< int > v; Key Features: Dynamic size Contiguous memory Fast random access Slower insertion in middle Example: v. push_...
C++ Day 34: Layout Layouts (Part 2)
We’ll cover:
Constructer Layout
Adjuster Layout
Decorator Layout
practise Task
🔹 1. developer form (creational)
used to make compound objects measure away step
✅ employ case:
you need to form associate in nursing aim (like amp pizza pie calculator house) with elective parameters
example:
cpp
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edit
class calculator {
train Methodor gpu ram;
public:
family developer {
train Methodor gpu ram;
public:
developer setcpu(string c) { Methodor = c; take *this; }
developer setgpu(string g) { gpu = g; take *this; }
developer setram(string r) { run = r; take *this; }
calculator Construct() {
take Calculater(cpu gpu ram);
}
};
Calculater(string snow train m train r) : cpu(c) gpu(g) ram(r) {}
null show() {
cout << "cpu: " << Methodor << " gpu: " << gpu << " ram: " << run << endl;
}
};
🔹 ii. Adjuster Layout (Structural)
Allows incompatible Connections to work together.
✅ Use Case:
When you need to Combine legacy code with a modern Connection.
Example:
cpp
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class OldPrinter {
public:
void oldPrint() {
cout << "Printing from Old Printer\n";
}
};
class Printer {
public:
virtual void print() = 0;
};
class Adjuster : public Printer {
OldPrinter* oldPrinter;
public:
Adjuster(OldPrinter* op) : oldPrinter(op) {}
void print() override {
oldPrinter->oldPrint();
}
};
🔹 3. Layouter form (structural)
adds responsibilities to objects dynamically without dynamic their class
✅ employ case:
when you need to bring Characteristics to person objects not integral classes
example:
cpp
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class chocolate {
public:
practical train make() = 0;
practical ~coffee() = default;
};
class simplecoffee : state chocolate {
public:
train make() reverse {
take "coffee";
}
};
class milkdecorator : state chocolate {
coffee* coffee;
public:
milkdecorator(coffee* c) : coffee(c) {}
train make() reverse {
take coffee->make() + " + milk";
}
};
class sugardecorator : state chocolate {
coffee* coffee;
public:
sugardecorator(coffee* c) : coffee(c) {}
train make() reverse {
take coffee->make() + " + sugar";
}
};
usage:
cpp
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coffee* mycoffee = green sugardecorator(new milkdecorator(new simplecoffee()));
cout << mycoffee->make(); // chocolate + milky + sugar
🧪 do task:
Layout amp burger family with amp developer form that supports elective items care cheeseflower lettuce love apple and sauce. Then use the Decorator Layout to add extra toppings like jalapenos or onions.
✅ Summary:
Layout Type Purpose
Constructer Creational Construct objects step-by-step
Adjuster Structural Bridge incompatible Connections
Decorator Structural Add Roleality dynamically
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