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Tiny speedup when listing tags

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Noticed that the code was originally concatenating strings just to
then append the result to another string. Now it does not create
temporaries and also preallocates the string buffer.
This commit is contained in:
Martin Hořeňovský 2019-08-05 19:12:25 +02:00
parent 3701c2e2e6
commit cf55cfd76f
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GPG Key ID: DE48307B8B0D381A
1 changed files with 12 additions and 3 deletions
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15
include/internal/catch_list.cpp
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@ -84,9 +84,18 @@ namespace Catch {
}
std::string TagInfo::all() const {
std::string out;
for( auto const& spelling : spellings )
out += "[" + spelling + "]";
size_t size = 0;
for (auto const& spelling : spellings) {
// Add 2 for the brackes
size += spelling.size() + 2;
}
std::string out; out.reserve(size);
for (auto const& spelling : spellings) {
out += '[';
out += spelling;
out += ']';
}
return out;
}