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cmStrCat(): optimize when first argument is an rvalue string

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This commit is contained in:
Kyle Edwards
2022-11-29 16:59:24 -05:00
parent d6f2a7ab4b
commit beba50bd61
3 changed files with 64 additions and 13 deletions
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18
Source/cmStringAlgorithms.cxx
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@@ -203,15 +203,23 @@ cmAlphaNum::cmAlphaNum(double val)
MakeDigits(this->View_, this->Digits_, "%g", val);
}
std::string cmCatViews(std::initializer_list<cm::string_view> views)
std::string cmCatViews(cm::optional<std::string>&& first,
std::initializer_list<cm::string_view> views)
{
std::size_t total_size = 0;
std::size_t totalSize = 0;
for (cm::string_view const& view : views) {
total_size += view.size();
totalSize += view.size();
}
std::string result(total_size, '\0');
std::string::iterator sit = result.begin();
std::string result;
std::string::size_type initialLen = 0;
if (first) {
totalSize += first->length();
initialLen = first->length();
result = std::move(*first);
}
result.resize(totalSize);
std::string::iterator sit = result.begin() + initialLen;
for (cm::string_view const& view : views) {
sit = std::copy_n(view.data(), view.size(), sit);
}