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What is std::format (C++20) and how does it improve string formatting?

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Answer

std::format provides Python-style, type-safe, positional string formatting that returns a std::string, replacing error-prone printf (no format/argument mismatches) and verbose iostream manipulators. It's extensible for user types via formatter specializations and is generally faster and safer than the alternatives.
std::string s = std::format("{} + {} = {}", 2, 3, 5);
Real-world example Replacing sprintf with std::format removes format-string vulnerabilities and type mismatches.

Common follow-ups: Why is std::format safer than printf? | How do you format custom types?

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