Menu
I understand you can use the inline keyword or just put a method in a class declaration ala short ctor or a getter method, but does the compiler make the final decision on when to inline my methods?
For instance:
inline void Foo::vLongBar()
{
//several function calls and lines of code
}
Will the compiler ignore my inline declaration if it thinks it will make my code inefficient?
As a side issue, if I have a getter method declared outside my class like this:
void Foo::bar() { std::cout << "baz"; }
Will the compiler inline this under the covers?
535
Automatic function inlining and static functions At -O2 and -O3 levels of optimization, or when --autoinline is specified, the compiler can automatically inline functions if it is practical and possible to do so, even if the functions are not declared as __inline or inline .
If the compiler decides that inlining the function will make the code slower, or unacceptably larger, it will not inline it. Or, if it simply cannot because of a syntactical dependency, such as other code using a function pointer for callbacks, or exporting the function externally as in a dynamic/static code library.
Inline functions are commonly used when the function definitions are small, and the functions are called several times in a program. Using inline functions saves time to transfer the control of the program from the calling function to the definition of the called function.
Remember, inlining is only a request to the compiler, not a command. Compiler can ignore the request for inlining.
Yes, the final decision of whether or not to inline your code lies in the C++ compiler. The inline keyword is a suggestion, not a requirement.
Here are some details as to how this decision is processed in the Microsoft C++ Compiler
157
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
