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fix: correct append_struct reserve calculation and optimize insertion #4416

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fix: correct append_struct reserve calculation and optimize insertion #4416

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7 changes: 2 additions & 5 deletions src/utility.h
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Original file line number Diff line number Diff line change
Expand Up @@ -202,13 +202,10 @@ namespace util {
void append_struct(std::vector<uint8_t> &buf, const T &_struct) {
constexpr size_t data_len = sizeof(_struct);

buf.reserve(data_len);
buf.reserve(buf.size() + data_len); // Reserve enough space upfront

auto *data = (uint8_t *) &_struct;

for (size_t x = 0; x < data_len; ++x) {
buf.push_back(data[x]);
}
buf.insert(buf.end(), data, data + data_len);
}

template<class T>
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