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