89 lines
1.5 KiB
C++
89 lines
1.5 KiB
C++
// (C) Copyright Beman Dawes 2008
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org/libs/config for more information.
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// MACRO: BOOST_NO_CXX11_CONSTEXPR
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// TITLE: C++0x constexpr unavailable
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// DESCRIPTION: The compiler does not support C++0x constexpr
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namespace boost_no_cxx11_constexpr {
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void quiet_warning(int){}
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constexpr int square(int x) { return x * x; } // from N2235
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// from 5.19:
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constexpr const int* addr(const int& ir) { return &ir; }
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static const int x = 5;
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constexpr const int* xp = addr(x);
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struct A
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{
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constexpr A(int i) : val(i) { }
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constexpr operator int()const { return val; }
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constexpr operator long()const { return 43; }
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private:
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int val;
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};
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template<int> struct X { };
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constexpr const A a = 42;
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X<a> xx; // OK: unique conversion to int
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// virtual function
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struct B
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{
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virtual void vf() {}
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};
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struct C : B
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{
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constexpr C() {}
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};
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// aggregate initialization
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struct D
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{
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int val[2];
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constexpr D() : val() {}
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};
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// virtual base
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struct E
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{
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};
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struct F : virtual E
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{
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};
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constexpr F& f(F& out) { return out; }
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namespace whatever{};
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constexpr int factorial(int i)
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{
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typedef int value_type;
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using namespace whatever;
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return i <= 1 ? 1 : i * factorial(value_type(i-1));
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}
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int test()
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{
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constexpr int i = square(5) + factorial(10);
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quiet_warning(i);
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switch (i)
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{
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case a:
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break;
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}
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return 0;
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}
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}
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