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Can anyone beat the performance of my integer to std::string conversion code?
Home Backend Development C++ Can You Outperform This Integer-to-String Conversion Code?

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

Dec 07, 2024 am 02:36 AM

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)

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