(C++) std::enable_if

 

std::enable_if is a C++11 ...

 

std::enable_if is a convenient way to leverage SFINAE to conditionally remove functions from overload resolution based on type traits and to provide separate function overloads and specializations for different type traits. std::enable_if can be used as an additional function argument (not applicable to operator overloads), as a return type (not applicable to constructors and destructors), or as a class template or function template parameter' [2].

 

 

 

 

 

Examples

 

• std::enable_if example 1: basics

 

 

 

 

 

Advice

 

• Distinguish among std::enable_if, static_assert, and =delete [1]

 

 

 

 

 

External links

 

1. cppreference.com its page about std::enable_if

 

 

 

 

 

References

 

1. Scott Meyers. C++ And Beyond 2012 session: 'Initial thoughts on Effective C++11'. 2012. 'Distinguish among std::enable_if, static_assert, and =delete'
2. cppreference.com its page about std::enable_if: 'This metafunction is a convenient way to leverage SFINAE to conditionally remove functions from overload resolution based on type traits and to provide separate function overloads and specializations for different type traits. std::enable_if can be used as an additional function argument (not applicable to operator overloads), as a return type (not applicable to constructors and destructors), or as a class template or function template parameter.'