diagrams:
t00101_class:
type: class
glob:
- t00101.cc
include:
namespaces:
- clanguml::t00101
using_namespace: clanguml::t00101File tests/t00101/t00101.cc
#include <concepts>
#include <memory>
#include <string>
#include <vector>
namespace clanguml {
namespace t00101 {
// Strategy pattern implementation using static polymorphism with C++20 concepts
// Example context: Text processing with different formatting strategies
// C++20 concept for Strategy interface using static polymorphism
template <typename T>
concept FormattingStrategyConcept = requires(T t, const std::string &text) {
{ t.format(text) } -> std::same_as<std::string>;
{ t.get_name() } -> std::same_as<std::string>;
};
// Template base for concrete strategies (CRTP)
template <typename Derived> class FormattingStrategyBase {
public:
std::string format(const std::string &text)
{
return static_cast<Derived *>(this)->format_impl(text);
}
std::string get_name()
{
return static_cast<Derived *>(this)->get_name_impl();
}
protected:
FormattingStrategyBase() = default;
};
// Concrete Strategy for plain text formatting
class PlainTextStrategy : public FormattingStrategyBase<PlainTextStrategy> {
public:
std::string format_impl(const std::string &text) { return text; }
std::string get_name_impl() { return "PlainText"; }
};
// Concrete Strategy for markdown formatting
class MarkdownStrategy : public FormattingStrategyBase<MarkdownStrategy> {
public:
std::string format_impl(const std::string &text)
{
return "# " + text + "\n";
}
std::string get_name_impl() { return "Markdown"; }
};
// Context template using static polymorphism and C++20 concepts
template <FormattingStrategyConcept StrategyType> class TextProcessor {
public:
explicit TextProcessor(StrategyType &strategy)
: strategy_(strategy)
{
}
std::string process_text(const std::string &text)
{
return strategy_.format(text);
}
std::string get_strategy_name() { return strategy_.get_name(); }
void set_strategy(StrategyType &new_strategy) { strategy_ = new_strategy; }
private:
StrategyType &strategy_;
};
// Client code demonstrating the Strategy pattern with static polymorphism
class DocumentProcessor {
public:
std::string process_as_plain_text(const std::string &content)
{
PlainTextStrategy strategy;
TextProcessor processor(strategy);
return processor.process_text(content);
}
std::string process_as_markdown(const std::string &content)
{
MarkdownStrategy strategy;
TextProcessor processor(strategy);
return processor.process_text(content);
}
template <FormattingStrategyConcept StrategyType>
std::string process_with_custom_strategy(
const std::string &content, StrategyType &strategy)
{
TextProcessor processor(strategy);
return processor.process_text(content);
}
};
// Factory for creating different strategies
class StrategyFactory {
public:
enum class StrategyType { PlainText, Markdown };
static std::unique_ptr<PlainTextStrategy> create_plain_text_strategy()
{
return std::make_unique<PlainTextStrategy>();
}
static std::unique_ptr<MarkdownStrategy> create_markdown_strategy()
{
return std::make_unique<MarkdownStrategy>();
}
};
} // namespace t00101
} // namespace clanguml
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