For example
template <typename T>
T foo(){ ... }
where T can only be a floating point type, that is float / double / long double
For example template <typename T> T foo(){ … } where T can only be
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For example
template <typename T>
T foo(){ ... }
where T can only be a floating point type, that is float / double / long double
It’s completely standard SFINAE; we enable on the return type. If T is not a floating point type,
std::is_floating_point<T>::valuewill befalseandstd::enable_if<false, T>does not provide atypetypedef, which causes the function to not be compilable.For information on these standard library classes see http://en.cppreference.com/w/cpp/types.