Choose efficient algorithms and data structures to avoid unnecessary computational complexity. Replace manual loops with optimized library functions, select appropriate containers based on access patterns, and use direct conversion paths when possible.
Choose efficient algorithms and data structures to avoid unnecessary computational complexity. Replace manual loops with optimized library functions, select appropriate containers based on access patterns, and use direct conversion paths when possible.
Key optimizations to consider:
memcmp()
instead of character-by-character loops for string comparisons to avoid quadratic complexityif (this_data == other_data) return true;
std::find_first_of()
with simple character checks when scanning for specific characters: result_offset += c == '\\' || c == '\'';
unordered_map
over map
when ordering is not required for better lookup performancestd::chrono::duration_cast<std::chrono::microseconds>(time_point.time_since_epoch()).count()
instead of intermediate conversions through time_t
Example of string comparison optimization:
bool operator==(const String &other) const {
if (this_size != other_size) return false;
const char *this_data = GetData();
const char *other_data = other.GetData();
// Short-circuit if same pointer
if (this_data == other_data) return true;
// Use optimized library function
return memcmp(this_data, other_data, this_size) == 0;
}
Always profile performance-critical code paths and prefer established algorithms over custom implementations when equivalent functionality exists.
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