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https://github.com/cookiengineer/audacity
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7e2b7e68ad
... in particular so that warnings on exit in the debug build on Windows are suppressed. Maybe it's not important to suppress them. Or maybe they suggest all is not correct in the MSVC implementation of this C++17 feature?
55 lines
1.7 KiB
C++
55 lines
1.7 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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MemoryX.cpp
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Paul Licameli
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**********************************************************************/
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#include "MemoryX.h"
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// Make the symbol table non-empty
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UTILITY_API void lib_utility_dummy_symbol()
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{}
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constexpr auto sizeof_align_val = sizeof(std::align_val_t);
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void *NonInterferingBase::operator new(std::size_t count, std::align_val_t al)
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{
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using namespace std;
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// Get an allocation with sufficient extra space to remember the alignment
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// (And to do that, adjust the alignment to be not less than the alignment of
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// an alignment value!).
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// Also increase the allocation by one entire alignment.
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al = max( al, static_cast<align_val_t>( alignof(align_val_t) ) );
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const auto al_as_size = static_cast<size_t>(al);
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auto ptr = static_cast<char*>(
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::operator new( count + sizeof_align_val + al_as_size ) );
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// Adjust the pointer to a properly aligned one, with a space just before it
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// to remember the adjustment
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ptr += sizeof_align_val;
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auto integer = reinterpret_cast<uintptr_t>(ptr);
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const auto partial = integer % al_as_size;
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auto adjustment = partial ? al_as_size - partial : 0;
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integer += adjustment;
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ptr = reinterpret_cast<char*>(integer);
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// Remember the adjustment
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*(reinterpret_cast<size_t*>(ptr) - 1) = adjustment;
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return ptr;
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}
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void NonInterferingBase::operator delete(void *ptr, std::align_val_t al)
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{
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// Find the adjustment
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auto adjustment = *(reinterpret_cast<size_t*>(ptr) - 1);
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// Apply the adjustment
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auto p = reinterpret_cast<char*>(ptr) - adjustment - sizeof_align_val;
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// Call through to default operator
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::operator delete(p);
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}
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