Monday, 15 June 2026

What is IFNDR in C++ And Why is it Important

The June 2026 meeting for the ISO Standard C++ group concluded in Brno. 

A key objective discussed was reduction in undefined behaviour (UB) and IFNDR ("ill formed no diagnostic required") scenarios in C++. 

IFNDR is used greatly in the C++ context and refers to a situation where a program is ill-formed but the compiler is not required to generate an error.  This can result in runtime issues.

A website summarised the dangers of UB can be found here.

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