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Generics and templated programming are both mechanisms in C to improve code reusability and type safety. Generics are type-checked at compile time, allowing the use of different types of data, whereas templated programming is compiled at instantiation time, requiring separate instantiation for each type. Despite their similarities, templated programming has a higher compile time overhead and generic functions or classes are easier to use with other types. Both mechanisms improve code reusability and type safety.
The difference and connection between template programming and generics
Introduction
Templated programming and generics are two mechanisms in C for writing reusable, type-safe code. While they have similarities, they also have key differences.
Generics
<t></t>
or class T
to indicate type parameters. For example: template<typename T> void printElement(T element) { cout << element << endl; }
Template programming
template
keyword to create a template, and use typename
to indicate the template parameter type. For example: template<typename T> class MyArray { T data[]; };
Difference
Contact
Practical case
Generics: Use generic functions to compare two values:
bool compare(T a, T b) { return a == b; }
Template programming: Use templated classes to implement variable-sized arrays:
class DynamicArray { T* data; size_t size; public: DynamicArray(size_t size) : data(new T[size]), size(size) {} };
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