V for CPP developers
Turiiya edited this page May 7, 2024
·
14 revisions
| Hello World | |
#include <iostream>
int main() {
std::cout << "Hello World!" << "\n";
} |
fn main() {
println('Hello World!')
} |
| Vector initialization | |
std::vector<int> numbers = {1, 2, 3, 4}; |
numbers := [1, 2, 3, 4] |
| Add an element to a vector | |
numbers.push_back(5); |
numbers << 5 |
| Printing a vector | |
std::copy(numbers.begin(), numbers.end(),
std::ostream_iterator<int>(std::cout, " "));
std::cout << '\n'; |
println(numbers) |
| Filtering a vector | |
std::copy_if(numbers.begin(), numbers.end(),
std::back_inserter(bar),
[](int i){ return i % 2 == 0; }); |
numbers.filter(it % 2 == 0) |
| Reading a file | |
#include <iostream>
#include <fstream>
std::ifstream f("path");
std::string text;
text.assign(std::istreambuf_iterator<char>(f), {});
if (!f)
std::cerr << "error reading from file\n"; |
import os
text := os.read_file(path) or {
eprintln(err)
} |
| Monomorphic function | |
template <typename T>
auto simple_fn(T param) {
return param;
}
auto value = simple_fn<int>1); |
fn simple_fn[T](param T) T {
return param
}
value := simple_fn(1)
|
| Monomorphic struct | |
template <typename T>
struct generic_struct {
T value;
void generic_method();
};
template <typename T>
generic_struct<T>:generic_method() {
return;
}
|
struct GenericStruct[T] {
value T
}
fn (g GenericStruct[T]) generic_method() {
return
} |
| Type reflection | |
#include <iostream>
using Number = int;
template <typename T>
consteval bool is_number(T data) {
if constexpr (std::is_same<T, Number>()) {
return true;
} else {
return false;
}
}
std::cout << is_number<Number>(0) << "\n"; |
type Number = int
fn is_number[T](data T) bool {
$if T is Number {
return true
} $else {
return false
}
}
println(is_number(Number(0)))
|
| Standard map | |
#include <iostream>
#include <map>
std::map<std::string, int> my_map {
{"KEY_1", 0},
{"KEY_2", 10},
};
for (const auto &[key, value] : my_map) {
std::cout << key << ": " << value << ", ";
}
std::cout << "\n"; |
my_map := {
'KEY_1': 0
'KEY_2': 10
}
println(my_map) |