...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
template <class T>
struct has_new_operator : public true_type-or-false_type
{};
Inherits: If T is a (possibly cv-qualified) type with an overloaded new-operator then inherits from true_type, otherwise inherits from false_type.
Compiler Compatibility: Requires working SFINAE (i.e. BOOST_NO_SFINAE is not set). Only a minority of rather old compilers do not support this. Also known to be broken with the Borland/Codegear compilers.
C++ Standard Reference: 12.5.
Header: #include
<boost/type_traits/has_new_operator.hpp>
or #include <boost/type_traits.hpp>
Examples:
Given:
class A { void* operator new(std::size_t); }; class B { void* operator new(std::size_t, const std::nothrow&); }; class C { void* operator new(std::size_t, void*); }; class D { void* operator new[](std::size_t); }; class E { void* operator new[](std::size_t, const std::nothrow&); }; class F { void* operator new[](std::size_t, void*); };
Then:
has_new_operator<A>
inherits fromtrue_type
.
has_new_operator<B>
inherits fromtrue_type
.
has_new_operator<C>
inherits fromtrue_type
.
has_new_operator<D>
inherits fromtrue_type
.
has_new_operator<E>
inherits fromtrue_type
.
has_new_operator<F>
inherits fromtrue_type
.