Substitution failure is not an error (SFINAE) refers to a situation in C++ where an invalid substitution of template parameters is not in itself an error. David Vandevoorde first introduced the acronym SFINAE to describe related programming techniques.

"Substitution Failure Is Not An Error". This rule applies during overload resolution of function templates: When substituting the explicitly specified or deduced type for the template parameter fails, the specialization is discarded from the overload set instead of causing a compile error.

I know that SFINAE stands for "substitution failure is not an error." But can someone show me a good use for SFINAE? This is a good question. I understand SFINAE pretty well, but I don't think I've ever had to use it (unless libraries are doing it without me knowing it).

SFINAE stands for Substitution Failure Is Not An Error. In rough terms, a substitution is the mechanism that tries to replace the template parameters with the provided types or values. In some cases, if the substitution leads to an invalid code, the compiler shouldn't throw a massive amount of...

SFINAE is a bit like a windmill. It sits as a wart in the middle of an interface, BUT it's useful to create elaborate static polymorphism, in particular before C++17 In this inspring talk, Stephen shows how to turn SFINAE around to make it very expressive in an interface. Watching this talk changed my way of...

SFINAE was added to the language to make templates usable for fundamental purposes. It was envisioned that a string class may want to overload The power that was unlocked by SFINAE was the ability to programmatically determine the type of an object, and force a particular overload based on...

What is SFINAE? Where can you use this metaprogramming technique? Are there any better alternatives in Modern C++? And how about Concepts from C++20? Read on to find out! Intro. Overload Resolution. Where can I use it? Std::enable_if - What's that? Expression SFINAE.

Prune functions that do not yield valid template instantiations from a set of overloaded functions. Substitution Failure Is Not An Error. Strictly, SFINAE is a language feature and not an idiom. However, this language feature is exploited in a very idiomatic fashion using enable-if.

How to use? This is a single header library. So just copy the file inside include/ into your project. The following SFINAE functions are provided: is_container<Container> has_find_method<Container, TypePassToFindMethod> has_key_type<Container, KeyType> has_value_type<Container...

SFINAE. In the latest draft of the C++11 standard, the relevant section is 14.8.2; it states that when a substitution failure, such as the one shown above, occurs, type deduction for this particular type The standard states: If a substitution results in an invalid type or expression, type deduction fails.

SFINAE stands for "Substitution Failure In Not An Error". Simply put, it means that when a compiler fails to substitute a template parameter it should One important thing to note is that SFINAE, like its name suggests, only happens during substitution. Essentially it means that, like above, providing an...

SFINAE stands for Substitution Failure Is Not An Error. Ill-formed code that results from substituting types (or values) to instantiate a function template or a class template is not a hard compile error, it is only treated as a deduction failure. Deduction failures on instantiating function templates or class...

SFINAE is an acronym for "substitution failure is not an error." It is derived from an arcane process used by C++ compilers during overload resolution. At its core, the idea is quite simple: if a candidate function template's specialization would lead to an ill-formed (compiler-internal) declaration of that...