Boost C++ Libraries

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

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has_nothrow_copy

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

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

Inherits: If T is a (possibly cv-qualified) type with a non-throwing copy-constructor then inherits from true_type, otherwise inherits from false_type. Type T must be a complete type.

These two traits are synonyms for each other.

Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template can not be used with function types.

Without some (as yet unspecified) help from the compiler, has_nothrow_copy will never report that a class or struct has a non-throwing copy-constructor; this is always safe, if possibly sub-optimal. Currently (May 2005) only Visual C++ 8 has the necessary compiler intrinsics to ensure that this trait "just works".

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


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