Updated V for CPP developers (markdown)

Turiiya 2024-04-10 02:40:53 +02:00
parent 5d05aa1d42
commit a08193931e

@ -2,234 +2,265 @@
<tr><td colspan="2" align="center">Hello World</td></tr>
<tr>
<td>
<pre class="highlight highlight-source-v">
#include &lt;iostream>
```cpp
#include <iostream>
int main() {
std::cout &lt;&lt; "Hello World!" &lt;&lt; "\n";
std::cout < "Hello World!" < "\n";
}
</pre>
```
</td>
<td valign="top">
<pre>
```v
fn main() {
println('Hello World!')
println('Hello World!')
}
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Vector initialization</td></tr>
<tr>
<td>
<pre>
std::vector&lt;int> numbers = {1, 2, 3, 4};
</pre>
```cpp
std::vector<int> numbers = {1, 2, 3, 4};
```
</td>
<td valign="top">
<pre>
```v
numbers := [1, 2, 3, 4]
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Add an element to a vector</td></tr>
<tr>
<td>
<pre>
```cpp
numbers.push_back(5);
</pre>
```
</td>
<td valign="top">
<pre>
numbers &lt;&lt; 5
</pre>
```v
numbers < 5
```
</td>
</tr>
<tr><td colspan="2" align="center">Printing a vector</td></tr>
<tr>
<td>
<pre>
```cpp
std::copy(numbers.begin(), numbers.end(),
std::ostream_iterator<int>(std::cout, " "));
std::cout &lt;&lt; '\n';
</pre>
std::ostream_iterator<int>(std::cout, " "));
std::cout < '\n';
```
</td>
<td valign="top">
<pre>
```v
println(numbers)
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Filtering a vector</td></tr>
<tr>
<td>
<pre>
std::copy_if(numbers.begin(), numbers.end(),
std::back_inserter(bar),
[](int i){ return i % 2 == 0; });
</pre>
```cpp
std::copy_if(numbers.begin(), numbers.end(),
std::back_inserter(bar),
[](int i){ return i % 2 == 0; });
```
</td>
<td valign="top">
<pre>
```cpp
numbers.filter(it % 2 == 0)
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Reading a file</td></tr>
<tr>
<td>
<pre>
#include &lt;iostream>
#include &lt;fstream>
```cpp
#include <iostream>
#include <fstream>
std::ifstream f("path");
std::string text;
text.assign(std::istreambuf_iterator<char>(f), {});
if (!f)
std::cerr &lt;&lt; "error reading from file\n";
</pre>
text.assign(std::istreambuf_iterator<char>(f), {});
if (!f)
std::cerr < "error reading from file\n";
```
</td>
<td valign="top">
<pre>
```v
import os
text := os.read_file(path) or {
eprintln(err)
eprintln(err)
}
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Monomorphic function</td></tr>
<tr>
<td>
<pre>
template &lt;typename T&gt;
```cpp
template <typename T>
auto simple_fn(T param) {
return param;
return param;
}
auto value = simple_fn&lt;int&gt;(1);
</pre>
auto value = simple_fn<int>1);
```
</td>
<td valign="top">
<pre>
fn simple_fn&lt;T&gt;(param T) T {
return param
```v
fn simple_fn[T](param T) T {
return param
}
value := simple_fn(1)
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Monomorphic struct</td></tr>
<tr>
<td>
<pre>
template &lt;typename T&gt;
```cpp
template <typename T>
struct generic_struct {
T value;
void generic_method();
T value;
void generic_method();
};
template &lt;typename T&gt;
generic_struct&lt;T&gt;::generic_method() {
return;
template <typename T>
generic_struct<T>:generic_method() {
return;
}
</pre>
```
</td>
<td valign="top">
<pre>
struct GenericStruct&lt;T&gt; {
value T
```v
struct GenericStruct[T] {
value T
}
fn (g GenericStruct&lt;T&gt;) generic_method() {
return
fn (g GenericStruct[T]) generic_method() {
return
}
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Type reflection</td></tr>
<tr>
<td>
<pre>
#include &lt;iostream&gt;
```cpp
#include <iostream>
using Number = int;
template &lt;typename T&gt;
template <typename T>
consteval bool is_number(T data) {
if constexpr (std::is_same&lt;T, Number&gt;()) {
return true;
} else {
return false;
}
if constexpr (std::is_same<T, Number>()) {
return true;
} else {
return false;
}
}
std::cout << is_number&lt;Number&gt;(0) << "\n";
</pre>
std::cout << is_number<Number>(0) << "\n";
```
</td>
<td valign="top">
<pre>
```v
type Number = int
fn is_number&lt;T&gt;(data T) bool {
&#36;if T is Number {
return true
} &#36;else {
return false
}
fn is_number[T](data T) bool {
&#36;if T is Number {
return true
} &#36;else {
return false
}
}
println(is_number(Number(0)))
</pre>
```
</td>
</tr>
<tr><td colspan="2" align="center">Standard map</td></tr>
<tr>
<td>
<pre>
#include &lt;iostream&gt;
#include &lt;map&gt;
```cpp
#include <iostream>
#include <map>
std::map<std::string, int> my_map {
{"KEY_1", 0},
{"KEY_2", 10},
{"KEY_1", 0},
{"KEY_2", 10},
};
for (const auto &[key, value] : my_map) {
std::cout << key << ": " << value << ", ";
std::cout << key << ": " << value << ", ";
}
std::cout << "\n";
</pre>
```
</td>
<td valign="top">
<pre>
```v
my_map := map {
'KEY_1': 0
'KEY_2': 10
'KEY_1': 0
'KEY_2': 10
}
println(my_map)
</pre>
```
</td>
</tr>
</table>