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

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

Inherits: If T is a (possibly cv-qualified) type with a non-throwing default-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 (unspecified) help from the compiler, has_nothrow_constructor will never report that a class or struct has a non-throwing default-constructor; this is always safe, if possibly sub-optimal. Currently (May 2011) compilers more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0, Intel-11.0, and Codegear have the necessary compiler intrinsics to ensure that this trait "just works". You may also test to see if the necessary intrinsics are available by checking to see if the macro BOOST_HAS_NOTHROW_CONSTRUCTOR is defined.

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