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Commit 145a139

Browse files
Merge remote-tracking branch 'dist/main'
2 parents 8c70093 + 52e7c9c commit 145a139

20 files changed

+437
-32
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‎CONTRIBUTING.md

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@@ -65,7 +65,7 @@ If your function doesn't return anything just show how to use it. If the result
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To ensure your snippet isn’t refused, consider these questions:
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- **Does the standard library of my language provide an easy way of doing this ?**
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- **Does that snippet have a real, and practical use case ?**
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- **Does that snippet not have a real, and practical use case ?**
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- **Could it be split into separate parts to be better understood ?**
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If any answer is yes, then your snippet will most likely get rejected.
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---
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Title: Filter Vector
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Description: Filters a vector using a predicate function.
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Author: majvax
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Tags: array,filter,c++23
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---
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```cpp
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#include <ranges>
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#include <vector>
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template <typename T, typename P>
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auto filter(const std::vector<T>& vec, P&& predicate) {
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return vec
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| std::views::filter(std::forward<P>(predicate))
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| std::ranges::to<std::vector<T>>();
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}
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// Usage:
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std::vector<int> vec = {1, 2, 3, 4, 5};
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std::vector<int> filtered = filter(vec, [](int i){ return i % 2 == 0; });
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// filtered contains 2 and 4
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```
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---
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Title: Transform Vector
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Description: Transforms a vector using a function.
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Author: majvax
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Tags: array,transform,c++23
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---
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```cpp
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#include <ranges>
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#include <vector>
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template <typename T, typename F>
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auto transform(const std::vector<T>& vec, F&& transformer) {
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using U = std::invoke_result_t<F, T>;
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return vec
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| std::views::transform(std::forward<F>(transformer))
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| std::ranges::to<std::vector<U>>();
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}
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// Usage:
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std::vector<int> vec = {1, 2, 3, 4, 5};
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std::vector<int> transformed = transform(vec, [](int i){ return i * 2; });
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// transformed contains 2, 4, 6, 8, 10
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```
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---
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Title: Find files recursively
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Description: Find all the files in a directory and subdirectories using a predicate function.
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Author: majvax
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Tags: filesystem,file_search,c++17
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---
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```cpp
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#include <filesystem>
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#include <vector>
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#include <string>
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template <typename P>
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std::vector<std::filesystem::path> find_files_recursive(const std::string& path, P&& predicate) {
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std::vector<std::filesystem::path> files;
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std::error_code ec;
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if (!std::filesystem::exists(path, ec) || ec)
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return files;
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if (!std::filesystem::is_directory(path, ec) || ec)
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return files;
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auto it = std::filesystem::recursive_directory_iterator(path, ec);
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if (ec)
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return files;
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for (const auto& entry : it)
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if (!std::filesystem::is_directory(entry) && predicate(entry.path()))
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files.push_back(entry.path());
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return files;
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}
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// Usage:
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// Find all files with size greater than 10MB
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auto files = find_files_recursive("Path", [](const auto& p) {
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return std::filesystem::file_size(p) > 10 * 1024 * 1024;
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});
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// Find all files with ".pdf" as extension
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auto files = find_files_recursive("Path", [](const auto& p) {
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return p.extension() == ".pdf";
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});
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// Find all files writed after The New Year
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#include <chrono>
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// need std=c++20
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auto jan_1_2025 = std::filesystem::file_time_type::clock::from_sys(
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std::chrono::sys_days{std::chrono::year{2025}/std::chrono::month{1}/std::chrono::day{1}}
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);
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auto files = find_files_recursive("Path", [jan_1_2025](const auto& p) {
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return std::filesystem::last_write_time(p) > jan_1_2025;
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}),
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```
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---
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Title: Find files
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Description: Find all the files in a directory using a predicate function.
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Author: majvax
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Tags: filesystem,file_search,c++17
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---
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```cpp
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#include <filesystem>
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#include <vector>
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#include <string>
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template <typename P>
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std::vector<std::filesystem::path> find_files(const std::string& path, P&& predicate) {
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std::vector<std::filesystem::path> files;
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std::error_code ec;
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if (!std::filesystem::exists(path, ec) || ec)
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return files;
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if (!std::filesystem::is_directory(path, ec) || ec)
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return files;
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auto it = std::filesystem::directory_iterator(path, ec);
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if (ec)
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return files;
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for (const auto& entry : it)
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if (!std::filesystem::is_directory(entry) && predicate(entry.path()))
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files.push_back(entry.path());
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return files;
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}
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// Usage:
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// Find all files with size greater than 10MB
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auto files = find_files("Path", [](const auto& p) {
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return std::filesystem::file_size(p) > 10 * 1024 * 1024;
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});
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// Find all files with ".pdf" as extension
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auto files = find_files("Path", [](const auto& p) {
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return p.extension() == ".pdf";
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});
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// Find all files writed after The New Year
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#include <chrono>
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// need std=c++20
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auto jan_1_2025 = std::filesystem::file_time_type::clock::from_sys(
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std::chrono::sys_days{std::chrono::year{2025}/std::chrono::month{1}/std::chrono::day{1}}
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);
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auto files = find_files("Path", [jan_1_2025](const auto& p) {
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return std::filesystem::last_write_time(p) > jan_1_2025;
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}),
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```
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---
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Title: List Directories
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Description: Lists all the directories in a path.
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Author: majvax
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Tags: filesystem,directories,c++17
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---
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```cpp
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#include <filesystem>
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#include <vector>
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#include <string>
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std::vector<std::filesystem::path> list_directories(const std::string& path) {
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std::vector<std::filesystem::path> files;
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std::error_code ec;
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if (!std::filesystem::exists(path, ec) || ec)
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return files;
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if (!std::filesystem::is_directory(path, ec) || ec)
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return files;
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auto it = std::filesystem::directory_iterator(path, ec);
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if (ec)
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return files;
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for (const auto& entry : it)
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if (std::filesystem::is_directory(entry))
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files.push_back(entry.path());
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return files;
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}
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// Usage:
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auto directories = list_directories("Path");
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```
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---
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title: Filter
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description: Filter a string with a predicate function
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author: majvax
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tags: string,filtering,c++23
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---
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```cpp
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#include <ranges>
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#include <string>
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template <typename P>
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std::string filter(const std::string& str, P&& predicate) {
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return str
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| std::ranges::views::filter(std::forward<P>(predicate))
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| std::ranges::to<std::string>();
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}
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// Usage:
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std::string str = "Hello, World!";
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std::string filtered = filter(str, [](char c){ return std::isalpha(c); });
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std::cout << filtered << std::endl; // HelloWorld
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```
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---
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title: Palindrome
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description: Check if a string is a palindrome or not.
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author: majvax
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tags: string,c++23
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---
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```cpp
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#include <string>
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#include <ranges>
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#include <algorithm>
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bool is_palindrome(const std::string& str) {
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std::string sanitized_string = str
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| std::ranges::views::filter([](char c){ return std::isalnum(c); })
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| std::ranges::views::transform([](char c){ return std::tolower(c); })
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| std::ranges::to<std::string>();
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return std::ranges::equal(sanitized_string, sanitized_string | std::views::reverse);
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}
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// Usage:
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bool pal = is_palindrome("A man, a plan, a canal, Panama"); // true
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```

‎snippets/cpp/string-manipulation/reverse-string.md

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title: Reverse String
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description: Reverses the characters in a string.
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author: Vaibhav-kesarwani
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tags: array,reverse
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tags: array,reverse,c++23
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---
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```cpp
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---
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title: Transform
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description: Transform a string with a function
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author: majvax
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tags: string,transform,c++23
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---
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```cpp
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#include <ranges>
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#include <string>
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template <typename F>
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std::string transform(const std::string& str, F&& transformer) {
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return str
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| std::ranges::views::transform(std::forward<F>(transformer))
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| std::ranges::to<std::string>();
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}
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// Usage:
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std::string str = "Hello, World!";
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std::string transformed = transform(str, [](char c){ return std::toupper(c); });
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std::cout << transformed << std::endl; // HELLO, WORLD!
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```

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