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 :)
51 lines
577 B
C++
51 lines
577 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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struct Rect {
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float x;
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float y;
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float w;
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float h;
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};
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struct Color {
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uint8_t r;
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uint8_t g;
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uint8_t b;
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uint8_t a;
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};
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union DisplayItem {
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enum class Tag : uint8_t {
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Fill,
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Image,
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ClearScreen,
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};
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struct Fill_Body {
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Tag tag;
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Rect _0;
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Color _1;
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};
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struct Image_Body {
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Tag tag;
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uint32_t id;
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Rect bounds;
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};
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struct {
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Tag tag;
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};
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Fill_Body fill;
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Image_Body image;
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};
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extern "C" {
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bool push_item(DisplayItem item);
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} // extern "C"
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