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How compile-time polymorphisms are implemented in C++?
- a)Using Inheritance
- b)Using Virtual functions
- c)Using Templates
- d)Using Inheritance and Virtual functions
Correct answer is option 'C'. Can you explain this answer?
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How compile-time polymorphisms are implemented in C++?a)Using Inherita...
Using Templates
Templates in C++ are a powerful feature that allows for compile-time polymorphism. Templates allow you to write generic code that can work with different data types without sacrificing type safety.
How Templates Enable Compile-Time Polymorphism
1. Generic Code: Templates allow you to write code that is independent of specific data types. You can define functions or classes with template parameters that represent generic types.
2. Compile-Time Instantiation: When you use a template, the compiler generates code for specific data types at compile time. This process is known as template instantiation. Each instantiation results in a separate version of the code tailored to the specific data type.
3. Type Safety: Templates provide type safety by performing type checking at compile time. This ensures that the code is valid for the specified data types and helps catch errors early in the development process.
4. Efficiency: Using templates for compile-time polymorphism can lead to more efficient code compared to runtime polymorphism mechanisms like virtual functions. Since the code is generated at compile time, there is no overhead associated with dynamic dispatch.
Example:
cpp
template
T add(T a, T b) {
return a + b;
}
int main() {
int sum_int = add(1, 2); // Instantiates add(int, int)
double sum_double = add(1.5, 2.5); // Instantiates add(double, double)
return 0;
}
In this example, the `add` function is defined as a template that can work with different numeric types. The compiler generates specific versions of the `add` function for `int` and `double` at compile time, enabling type-safe polymorphism without runtime overhead.
Templates in C++ are a powerful feature that allows for compile-time polymorphism. Templates allow you to write generic code that can work with different data types without sacrificing type safety.
How Templates Enable Compile-Time Polymorphism
1. Generic Code: Templates allow you to write code that is independent of specific data types. You can define functions or classes with template parameters that represent generic types.
2. Compile-Time Instantiation: When you use a template, the compiler generates code for specific data types at compile time. This process is known as template instantiation. Each instantiation results in a separate version of the code tailored to the specific data type.
3. Type Safety: Templates provide type safety by performing type checking at compile time. This ensures that the code is valid for the specified data types and helps catch errors early in the development process.
4. Efficiency: Using templates for compile-time polymorphism can lead to more efficient code compared to runtime polymorphism mechanisms like virtual functions. Since the code is generated at compile time, there is no overhead associated with dynamic dispatch.
Example:
cpp
template
T add(T a, T b) {
return a + b;
}
int main() {
int sum_int = add(1, 2); // Instantiates add
double sum_double = add(1.5, 2.5); // Instantiates add
return 0;
}
In this example, the `add` function is defined as a template that can work with different numeric types. The compiler generates specific versions of the `add` function for `int` and `double` at compile time, enabling type-safe polymorphism without runtime overhead.
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How compile-time polymorphisms are implemented in C++?a)Using Inherita...
Compile-time polymorphism is implemented using templates in which the types(which can be checked during compile-time) are used decides which function to be called.
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How compile-time polymorphisms are implemented in C++?a)Using Inheritanceb)Using Virtual functionsc)Using Templatesd)Using Inheritance and Virtual functionsCorrect answer is option 'C'. Can you explain this answer?
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