Inline and lambda function
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The document discusses the use of inline functions and lambda functions in C++, explaining their definitions, syntax, and differences. It highlights how lambda functions allow for creating anonymous functions that can be defined inline, while inline functions are copied into the code at call sites. The key distinction is that inline functions persist throughout the program, whereas lambda functions are temporary objects used during their invocation.
{cout << v << " “;});
for_each(vec.begin(), vec.end(), [ ](int& v){ static int n = 1; v = n++;});
for_each(vec.begin(), vec.end(), [ ](int v){cout << v << " “;});
return 0;
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{definition});
This call causes to runtime create variables
It is not available in < g++11 versions so for that we use another procedure called
inline](https://image.slidesharecdn.com/inlineandlambdafunction-190120121931/85/Inline-and-lambda-function-5-320.jpg)
Inline and lambda function
- 1. INLINE FUNCTION The lambda function declaration type and Inline
- 2. NORMAL FUNCTION Function definition is above main() Function is called inside main() #include <iostream> #include <algorithm> #include <vector> using namespace std; void assign(int& v){ static int n = 1; v = n++; } void print(int v){ cout << v << " "; } int main(){ vector<int> vec(10); for_each(vec.begin(), vec.end(), print); for_each(vec.begin(), vec.end(), assign); for_each(vec.begin(), vec.end(), print); return 0; } Assign Print
- 3. LAMBDA FUNCTIONS C++11 provides the ability to create anonymous functions, called lambda functions. It allows a function to be defined at the point where it's needed in another expression. It is a function that we can write inline in our code in order to pass in to another function.
- 4. LAMBDA DECLARATION AND CALLS Assign Print Print #include <iostream> #include <algorithm> #include <vector> using namespace std; int main(){ vector<int> vec(10); for_each(vec.begin(), vec.end(), [ ](int v){cout << v << " “;}); for_each(vec.begin(), vec.end(), [ ](int& v){ static int n = 1; v = n++;}); for_each(vec.begin(), vec.end(), [ ](int v){cout << v << " “;}); return 0; }
- 5. MORE ABOUT LAMBDA It is a function creation inside another function Output = function (input, input, [ ](output){definition}); This call causes to runtime create variables It is not available in < g++11 versions so for that we use another procedure called inline
- 6. INLINE FUNCTION Write inline with the function name before the output type InlineType Name (inputs..) #include <iostream> #include <algorithm> #include <vector> using namespace std; Inline void assign(int& v){ static int n = 1; v = n++; } Inline void print(int v){ cout << v << " "; } int main(){ vector<int> vec(10); for_each(vec.begin(), vec.end(), print); for_each(vec.begin(), vec.end(), assign); for_each(vec.begin(), vec.end(), print); return 0; } Assign Print Print
- 7. MORE ABOUT INLINE Inline functions are the functions which on call by the compiler are copied to the set. Where ever the function call is found it is replaced by its code. Inline functions are declared by adding Inline keyword in front of the name. Rest they have same defining pattern as normal function.
- 8. INLINEVS LAMBDA NOTATION FUNCTION (INLINE IS NOT A REPLACEMENT OF LAMBDA DECLARATION) Lambda functions, as they are called, are a way of creating a object that represents a function. The object is then commonly passed to other functions to control how the other functions work. Take a look at sort() or transform() from the standard library to see what I mean. (There's some templates involved to make this work in C++, but that's outside the scope of this answer.) Inline function is always available for call whereas Lambda is gone with the call. Thus, these two things are pretty much unrelated to each other.They're not substitutes of each other in any way at all.
Editor's Notes
- #7: // simple memory: Output Size: 1.8488130569458 MiB (0.01s less) //inline memory: Output Size: 1.84916877746582 MiB (+300bits more)