How Can an STL Map Enhance Scripting Engine Efficiency?

Improving Scripting Engine Efficiency with an STL Map of Function Pointers

To enhance the efficiency of your scripting engine, employing an STL map with strings as keys and function pointers as values proves advantageous compared to the conventional "if..else if" approach. This solution offers several benefits:

• Association of Names with Function Pointers: The map allows for the direct lookup of function pointers based on their corresponding names.
• Removal of Branching Overhead: The if..else if construct introduces branching overhead, whereas using a map directly jumps to the desired function.
• Support for Various Callable Objects: Instead of being strictly limited to function pointers, the ScriptFunction type can be generalized to std::function, enabling support for any callable type.

Implementation:

<code class="cpp">typedef std::function<void()> ScriptFunction;
typedef std::unordered_map<std::string, ScriptFunction> script_map;

// ...

script_map m;
m.emplace("blah", &some_function);

// ...

void call_script(const std::string& pFunction)
{
    auto iter = m.find(pFunction);
    if (iter == m.end())
    {
        // not found
    }

    iter->second();
}</code>

This approach ensures faster and more efficient function invocation in your scripting engine.

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