Boost C++ Libraries of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the develop branch, built from commit 36319504d5.


template <class T>
struct is_complete : public true_type-or-false_type {};

Inherits: If T is a complete type then inherits from true_type, otherwise inherits from false_type.

[Important] Important

This trait is designed for one use only: to trigger a hard error (via a static_assert) when a template is accidentally instantiated on an incomplete type. Any other use case will cause ODR violations as the "completeness" of type T may vary at different points in the current translation unit, as well as across translations units. In particular this trait should never ever be used to change code paths depending on the completeness of a type.

Header: #include <boost/type_traits/is_complete.hpp> or #include <boost/type_traits.hpp>

Compiler Compatibility: Requires C++11 SFINAE-expressions to function fully. The macro BOOST_TT_HAS_WORKING_IS_COMPLETE is defined when the trait is fully functional.