Helping the Compiler Deduce the Type of a Template Argument

Helping the Compiler Deduce the Type of a Template Argument

The argument type of a function template is normally deduced automatically. For example:

      int n = max (5,10); /* max deduced 
because 5 and 10 are of type int */

However, sometimes the compiler needs more explicit clues regarding the type of the argument, as in the following example:

      template < class T >  T f()  {    return  static_cast< T > (0);  }   int main() {    int  n =  f();//error, can't deduce argument type    double d = f(); //error, can't deduce argument type}

The program fails to compile because the compiler cannot deduce what the type of the argument is. The return type alone is insufficient for that purpose and because the function template f() takes no arguments, the compiler is clueless. In situations like these, C++ enables you state the type of the template explicitly, thereby helping the compiler figure out the template’s argument type:

      int i = f(); //now OK  double d = f(); //ditto
Share the Post:
Heading photo, Metadata.

What is Metadata?

What is metadata? Well, It’s an odd concept to wrap your head around. Metadata is essentially the secondary layer of data that tracks details about the “regular” data. The regular

XDR solutions

The Benefits of Using XDR Solutions

Cybercriminals constantly adapt their strategies, developing newer, more powerful, and intelligent ways to attack your network. Since security professionals must innovate as well, more conventional endpoint detection solutions have evolved

AI is revolutionizing fraud detection

How AI is Revolutionizing Fraud Detection

Artificial intelligence – commonly known as AI – means a form of technology with multiple uses. As a result, it has become extremely valuable to a number of businesses across

AI innovation

Companies Leading AI Innovation in 2023

Artificial intelligence (AI) has been transforming industries and revolutionizing business operations. AI’s potential to enhance efficiency and productivity has become crucial to many businesses. As we move into 2023, several

data fivetran pricing

Fivetran Pricing Explained

One of the biggest trends of the 21st century is the massive surge in analytics. Analytics is the process of utilizing data to drive future decision-making. With so much of

kubernetes logging

Kubernetes Logging: What You Need to Know

Kubernetes from Google is one of the most popular open-source and free container management solutions made to make managing and deploying applications easier. It has a solid architecture that makes