Emilio Cobos Álvarez
b2e224354b
Using operator= is not quite sound in presence of destructors and operator overloading. It's perfectly fine to assume that the left-hand-side of an operator= expression is valid memory, however we're using uninitialized memory here, that may not be the case. Use placement new to properly construct tagged unions. I don't need this with any urgency, but it's the right thing to do in presence of complex types, and the current code seems a bomb waiting to explode :)
41 lines
481 B
C++
41 lines
481 B
C++
#include <cstdarg>
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#include <cstdint>
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#include <cstdlib>
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#include <new>
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#if defined(NOT_DEFINED)
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static const int32_t DEFAULT_X = 8;
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#endif
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#if defined(DEFINED)
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static const int32_t DEFAULT_X = 42;
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#endif
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#if (defined(NOT_DEFINED) || defined(DEFINED))
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struct Foo {
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int32_t x;
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};
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#endif
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#if defined(NOT_DEFINED)
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struct Bar {
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Foo y;
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};
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#endif
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#if defined(DEFINED)
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struct Bar {
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Foo z;
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};
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#endif
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struct Root {
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Bar w;
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};
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extern "C" {
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void root(Root a);
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} // extern "C"
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