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 :)
40 lines
1.2 KiB
C++
40 lines
1.2 KiB
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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/// Constants shared by multiple CSS Box Alignment properties
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/// These constants match Gecko's `NS_STYLE_ALIGN_*` constants.
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struct AlignFlags {
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uint8_t bits;
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explicit operator bool() const {
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return !!bits;
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}
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AlignFlags operator|(const AlignFlags& other) const {
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return {static_cast<decltype(bits)>(this->bits | other.bits)};
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}
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AlignFlags& operator|=(const AlignFlags& other) {
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*this = (*this | other);
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return *this;
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}
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AlignFlags operator&(const AlignFlags& other) const {
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return {static_cast<decltype(bits)>(this->bits & other.bits)};
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}
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AlignFlags& operator&=(const AlignFlags& other) {
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*this = (*this & other);
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return *this;
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}
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};
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static const AlignFlags AlignFlags_AUTO = (AlignFlags){ .bits = 0 };
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static const AlignFlags AlignFlags_NORMAL = (AlignFlags){ .bits = 1 };
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static const AlignFlags AlignFlags_START = (AlignFlags){ .bits = 1 << 1 };
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static const AlignFlags AlignFlags_END = (AlignFlags){ .bits = 1 << 2 };
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static const AlignFlags AlignFlags_FLEX_START = (AlignFlags){ .bits = 1 << 3 };
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extern "C" {
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void root(AlignFlags flags);
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} // extern "C"
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