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"I think that the new C++20 standard might be one of the main causes for this," TIOBE CEO Paul Jansen said in the latest report.

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C++20 wasn't even ratified until earlier this month. I seriously doubt that most industry programmers are using it, or even have access to C++20 toolchains.

My new job is to port a company forward to C++11, FML.

Right, but TIOBE doesn't measure usage. It measures popularity by way of search engines. As people blog about their favorite new feature of C++20, it drives interest.

Actually I did not know that. I thought it was some kind of field survey. How did they do it in the 80s?

The FAQ says that their dataset only goes back until June of 2001, so I imagine the methodology for the prior years in the Very Long Term History section was somewhat different.

The claim at the top of the page is that "The ratings are based on the number of skilled engineers world-wide, courses and third party vendors." However, the details show that it really is just a single search term across a variety of search engines. Maybe they used to have an intern read the classifieds at the back of the Communications of the ACM or something.

Perhaps it is because school is starting ( physically or online ) and many high schools/colleges teach C/C++? I wonder if there is a slight bump in C++ use every september?

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