Can You Outperform This Integer-to-String Conversion Code?

Can anyone beat the performance of my integer to std::string conversion code?

Problem:

Efficiently converting an integer into a std::string is a challenge that has sparked the creation of various methods. This article explores different approaches and invites submissions to compare their performance.

Methods:

Common methods include:

• The "C way": Using a stringstream.
• sprintf: Often recommended for performance.
• Boost's lexical_cast: Has its own implementation that doesn't rely on stringstreams.
• Ben's algorithms: Optimized for both desktop and embedded systems.
• ltoa (non-standard): Widely available, but its use may be limited.

Rules:

Submissions should adhere to specific guidelines:

• Convert both signed and unsigned 32-bit integers into decimals.
• Produce output as a std::string.
• Ensure compatibility with threading and signals.
• Assume an ASCII character set.
• Handle INT_MIN correctly on a two's complement machine.
• Output should be identical to the canonical C version using a stringstream.
• Compile and execute on VC 2010 and g .

Results:

The winning submissions demonstrated significant performance improvements:

• Eugene Smith's code: 8 times faster than sprintf on g (http://ideone.com/0uhhX)
• Timo's code: 15 times faster than sprintf on Visual C (http://ideone.com/VpKO3)

The above is the detailed content of Can You Outperform This Integer-to-String Conversion Code?. For more information, please follow other related articles on the PHP Chinese website!