[buffer.h] add static test for alignment
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@ -26,6 +26,7 @@
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#include <boost/noncopyable.hpp>
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#include <boost/optional.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/static_assert.hpp>
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#include <stdexcept>
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@ -43,6 +44,9 @@ namespace persistent_data {
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template <uint32_t Size = DEFAULT_BUFFER_SIZE, uint32_t Alignment = 512>
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class buffer : private boost::noncopyable {
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public:
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BOOST_STATIC_ASSERT_MSG((Alignment > 1) && !(Alignment & (Alignment - 1)),
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"Alignment must be a power of two.");
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typedef boost::shared_ptr<buffer> ptr;
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typedef boost::shared_ptr<buffer const> const_ptr;
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@ -73,7 +77,11 @@ namespace persistent_data {
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// Allocates size bytes and returns a pointer to the
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// allocated memory. The memory address will be a
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// multiple of 'Alignment', which must be a power of two
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return memalign(Alignment, s);
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void *mem = memalign(Alignment, s);
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if (!mem)
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throw std::bad_alloc();
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return mem;
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}
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static void operator delete(void *p) {
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@ -82,6 +82,7 @@ BOOST_AUTO_TEST_CASE(buffer_8_a_8_access)
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BOOST_CHECK_EQUAL((*b)[0], '\0');
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}
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#if 0
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BOOST_AUTO_TEST_CASE(buffer_8_a_8_const_access)
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{
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uint32_t const sz = 8, align = 8;
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@ -89,6 +90,7 @@ BOOST_AUTO_TEST_CASE(buffer_8_a_8_const_access)
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(*b)[0] = 0; // Compile time error accessing read-only location
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}
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#endif
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// 8 byte buffer size, varying alignment from 1 - 7
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BOOST_AUTO_TEST_CASE(buffer_128_a_1_fails)
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@ -97,6 +99,7 @@ BOOST_AUTO_TEST_CASE(buffer_128_a_1_fails)
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buffer<sz, align>::ptr b = create_buffer<sz, align>();
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BOOST_CHECK(!b);
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BOOST_CHECK_EQUAL((unsigned long) b->raw() & (align - 1), 1);
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}
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BOOST_AUTO_TEST_CASE(buffer_128_a_2_succeeds)
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