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Code Issues 150 Wiki Activity

perf(uuid): text form of an uuid made without a string stream, same output

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Hirek
2026-10-06 03:35:06 +02:00
parent 3a05d0d649
commit e8c00b8a2d
1 changed files with 11 additions and 17 deletions
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28
utilities/uuid.hpp
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@@ -28,23 +28,17 @@ public:
}
std::string to_string() const {
std::ostringstream os;
os << std::hex << std::setfill('0');
auto put = [&](int i){
os << std::setw(2) << static_cast<int>(bytes[i]);
};
// format 8-4-4-4-12
for (int i = 0; i < 4; ++i) put(i);
for (int i = 4; i < 6; ++i) put(i);
os << '-';
for (int i = 6; i < 8; ++i) put(i);
os << '-';
for (int i = 8; i < 10; ++i) put(i);
os << '-';
for (int i = 10; i < 12; ++i) put(i);
os << '-';
for (int i = 12; i < 16; ++i) put(i);
return os.str();
// NOTE: done by hand as the text is made for each model instance of a scenery, and a string stream took a few microseconds each
static constexpr char digits[] = "0123456789abcdef";
std::string text;
text.reserve(36);
// format 12-4-4-4-8, the one node names in scenery files were written with
for (int i = 0; i < 16; ++i) {
if (i == 6 || i == 8 || i == 10 || i == 12) text += '-';
text += digits[bytes[i] >> 4];
text += digits[bytes[i] & 0x0F];
}
return text;
}
static UID from_string(const std::string& str) {