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Optimize string creation

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This commit is contained in:
Massimiliano Riva 2024-03-17 20:34:14 +01:00
parent be7edb56bf
commit bed0cf9d04
1 changed files with 17 additions and 9 deletions
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26
include/spdlog/pattern_formatter-inl.h
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@ -877,16 +877,24 @@ public:
void format(const details::log_msg &, const std::tm &, memory_buf_t &dest) override {
auto mdc_map = mdc::get_context();
if (!mdc_map.empty()) {
auto last_element = *(--mdc_map.end());
for (const auto &pair : mdc_map) {
std::string mdc_content_;
if (pair != last_element) {
mdc_content_ = pair.first + ':' + pair.second + ' ';
} else {
mdc_content_ = pair.first + ':' + pair.second;
auto last_element = --mdc_map.end();
for (auto it = mdc_map.begin(); it != mdc_map.end(); ++it) {
auto &pair = *it;
const auto &key = pair.first;
const auto &value = pair.second;
size_t content_size = key.size() + value.size() + 1; // 1 for ':'
if (it != last_element) {
content_size++; // 1 for ' '
}
ScopedPadder p(content_size, padinfo_, dest);
fmt_helper::append_string_view(key, dest);
fmt_helper::append_string_view(":", dest);
fmt_helper::append_string_view(value, dest);
if (it != last_element) {
fmt_helper::append_string_view(" ", dest);
}
ScopedPadder p(mdc_content_.size(), padinfo_, dest);
fmt_helper::append_string_view(mdc_content_, dest);
}
}
}