How to Use Template Specialization
Syntax of Template Specialization
To understand how template specialization works, we first need to grasp what happens under the hood when a template is called with a specific data type.
When you call a template function with a particular type, the compiler generates a concrete instance of the template for that type. This process is called template instantiation. Essentially, the compiler substitutes the template parameter with the provided type and creates a specialized version of the function.
main.cpp
header.h
123456789101112#include <iostream> template<typename T> T TemplateFunction(T value) { return value; } int main() { // When the compiler encounters this line // It generates a function for the specified type // VVV TemplateFunction<int>(5); }
But first, it checks if a substitution for this function already exists. There's no point in generating multiple instances of this function if it's called with the same type repeatedly. With this knowledge, we can use it for our purposes.
Swipe to start coding
Create a template specialization for the TemplateFunction that handles std::string data types.
- Implement a specialization for
TemplateFunctionto processstd::stringparameters differently. - Ensure that any string passed as a parameter has
"Specialized: "added to the beginning of the returned value.
Lösning
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Syntax of Template Specialization
To understand how template specialization works, we first need to grasp what happens under the hood when a template is called with a specific data type.
When you call a template function with a particular type, the compiler generates a concrete instance of the template for that type. This process is called template instantiation. Essentially, the compiler substitutes the template parameter with the provided type and creates a specialized version of the function.
main.cpp
header.h
123456789101112#include <iostream> template<typename T> T TemplateFunction(T value) { return value; } int main() { // When the compiler encounters this line // It generates a function for the specified type // VVV TemplateFunction<int>(5); }
But first, it checks if a substitution for this function already exists. There's no point in generating multiple instances of this function if it's called with the same type repeatedly. With this knowledge, we can use it for our purposes.
Swipe to start coding
Create a template specialization for the TemplateFunction that handles std::string data types.
- Implement a specialization for
TemplateFunctionto processstd::stringparameters differently. - Ensure that any string passed as a parameter has
"Specialized: "added to the beginning of the returned value.
Lösning
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