7f5410cc8b
The latter form can accept pointers, but the template lengthof cannot.
41 lines
882 B
C++
41 lines
882 B
C++
/* No include guard - this file is safe to reuse */
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#if defined(DXX_WANT_ARRAY) && !defined(DXX_INCLUDED_ARRAY)
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#define DXX_INCLUDED_ARRAY
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#ifdef DXX_HAVE_CXX_ARRAY
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#include <array>
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using std::array;
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#endif
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#ifdef DXX_HAVE_CXX_TR1_ARRAY
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#include <tr1/array>
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using std::tr1::array;
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#endif
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#ifdef DXX_HAVE_BOOST_ARRAY
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#include <boost/array.hpp>
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using boost::array;
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#endif
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#endif
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#if defined(DXX_WANT_LENGTHOF) && !defined(DXX_INCLUDED_LENGTHOF)
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#define DXX_INCLUDED_LENGTHOF
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#ifdef DXX_HAVE_CXX11_FUNCTION_AUTO
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#include <cstddef>
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#ifdef DXX_HAVE_CXX11_EXPLICIT_DELETE
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template <typename T>
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static void array_identity(T) = delete;
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#endif
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template <typename T, std::size_t N>
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static auto array_identity(T (&t)[N]) -> T(&)[N] { return t; }
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#define lengthof(A) (sizeof((array_identity)(A)) / sizeof((A)[0]))
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#else
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#define lengthof(A) (sizeof((A)) / sizeof((A)[0]))
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#endif
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#endif
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