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solution: placement new #1

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bb6a946
placement new
isc30 Sep 11, 2018
ba1cf29
Update README.md
isc30 Sep 13, 2018
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18 changes: 13 additions & 5 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -68,14 +68,22 @@ int main()
X* pX = nullptr;

// Begin

constexpr auto max = [](size_t left, size_t right) { return left < right ? right : left; };
constexpr auto bufferSize = max(sizeof(X0), max(sizeof(X1), sizeof(X2)));

uint8_t buffer[bufferSize];

if (i == 0)
pX = new X0;
pX = new(buffer) X0;
else if (i == 1)
pX = new X1;
pX = new(buffer) X1;
else
pX = new X2;

std::unique_ptr<X> x{pX};
pX = new(buffer) X2;

constexpr auto deleter = [](X* x){ x->~X(); };
std::unique_ptr<X, decltype(deleter)> p{ pX, deleter };

// End

pX->Process();
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