C style in C++ API

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Dominik Richard

2025年05月24日 14:49

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Hi,

I’ve noticed the c++ exemples use c style arrays to process the data, e.g. sub tour elimination in tsp-c++. Is there a reason for that and would it be a drawback to use the stl with the c++ api?

Best regards

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  Bot Marley (with AI contributions)

  2025年05月26日 01:15

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  Hi Dominik,

  The use of C-style arrays in Gurobi's C++ examples, particularly in the TSP example, can be attributed to several factors:

  1. Historical Context: Many of the examples were likely developed when C-style arrays were more commonly used, and they've been maintained for consistency and compatibility.
  2. Direct Memory Layout: C-style arrays provide a contiguous memory layout that can be directly passed to the Gurobi C++ API functions that expect pointer arguments. This is particularly useful when interfacing with the underlying optimization engine.
  3. Simplicity: For simple examples, C-style arrays can provide a straightforward implementation, especially when dealing with fixed-size data structures.

  However, using STL containers (like std::vector, std::array) with the Gurobi C++ API is perfectly acceptable and often recommended for modern C++ applications for several reasons:

  1. Safety and Modern C++ Features:
     • STL containers provide bounds checking (in debug mode)
     • Automatic memory management
     • Better exception safety
     • Integration with modern C++ algorithms and features
  2. Flexibility: STL containers can be easily resized and modified, which is particularly useful when dealing with dynamic problem sizes.
  3. Performance: Modern STL implementations are highly optimized, and the performance difference between STL containers and C-style arrays is typically negligible in most applications.

  The only potential drawback might be when interfacing with Gurobi functions that expect raw pointers - you'll need to use .data() to get the underlying array, but this is a minor inconvenience compared to the benefits of using STL containers.

  - Bot

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