Putting the fun in C++

The post-Kona mailing list of the new standards papers has been recently published (you can find it here). Going through the titles I could not help smiling because some of them are really funny. So I decided to make a top 10 of the funniest paper titles.

Little-known C++: operator auto

A user-defined conversion function enables an implicit or explicit conversion between types. Such, a function has the following form (no return type and no parameters):

struct foo
{
   operator int() const {return 42;}
};

foo f;
int i = f;  // implicit conversion

Little-known C++: function-try-block

Function-try-block is a mechanism in C++ to establish an exception handler around the body of a function. The following is an example:

int foo() 
{
   throw std::runtime_error("oops...");
}

int main()
try
{
   foo();
   return 0;
}
catch (...)
{
   return -1;
}

C++ code samples before and after Ranges

The Ranges library proposal has been accepted for C++20 at the San Diego meeting of the standard committee in November last year. The library provides components for handling ranges of values aimed at simplifying our code. Unfortunately, the Ranges library is not very well documented, which makes it harder to grasp for those that want to learn it. This post is intended as an introduction based on examples of code written with and without Ranges.

Join the East Const revolution!

The C++ community has worked hard in the past decade and more to move the language forward, to enrich but also simplify it, and to adopt new paradigms and coding styles. Yet, a single topic, a simple matter of style is splitting the community, in a pure Swiftian manner: the use of the const qualifier that some prefer it on the left of what it modifies, as it has been the de facto standard for decades, and which is now called West const, or to the right of that it modifies, that is a style that more and more people are adopting, and which is now called East const. I don’t particularly like this terms, I would rather use left const and right const, but if this is what the community prefers to use let’s call them so for consistency.

moneycpp – a C++ library for handling monetary values

I have been working lately on a C++ library for handling monetary values, currencies, rounding and other related features. It is called moneycpp and it’s a C++ 17 header-only, cross-platform library available on GitHub.

The library is intended for being used in a variety of types of application including ERP systems, banking, finance, insurance, games, and others.

The following is a list of its core requirements:

When a type is not a type

Class template argument deduction is a useful feature in C++17 that helps developers to simplify the code by avoiding writing the template argument list when initializing objects of class templates (or when performing function-style casts). The compiler provides an implicit set of deduction guides, which are fictional function templates for a hypothetical class and uses them to perform template argument deduction and overload resolution. However, you can extend this set of deduction guides with your own, and in some cases, such as for aggregate types, you need to do so.