What are the opportunities to use C++ function inline functions?

Application timing: Frequently called functions with lower computational overhead have shorter function bodies

C Function inline function application timing

Inline functions are a compiler optimization that inserts the function body directly into the call site instead of generating call instructions like a normal function. This can greatly improve performance, but it also has some limitations.

Application timing

Inline functions are suitable for the following situations:

• Frequently called functions: For frequently called functions Called functions, inlining can significantly improve performance by eliminating the overhead of function calls.
• Functions with lower computational overhead: The larger the size of the inline function, the greater the compiler optimization overhead. Therefore, functions suitable for inlining should have low computational overhead.
• Shorter function body: The size of the inline function cannot be too large, otherwise the compiler will refuse to inline it. Generally speaking, the length of a function body should not exceed 50 lines.

Practical case

The following is a practical case of an inline function:

inline int max(int a, int b) {
  return (a > b) ? a : b;
}

int main() {
  int x = 5, y = 7;
  int max_value = max(x, y); // 内联调用max函数
  cout << "Max value: " << max_value << endl;

  return 0;
}

In the above code, max function is an inline function that calculates the maximum of two integers. Since the max function is called frequently, has low computational overhead and a short function body, it is suitable for inline optimization.

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