Example 2: CETL span type.

Full example for cetl::pf20::span

#include "cetl/pf20/span.hpp"
#include <iostream>
#include <string>
#include <algorithm>
 
#include <gtest/gtest.h>
 
TEST(example_02_span, dynamic_span)
{
std::string greeting{"Hello Dynamic World."};
// Works just like a std::span...
cetl::pf20::span<const char> dynamic{greeting.c_str(), 13};
auto print = [](const char c) { std::cout << c; };
 
// Print just the characters in the span...
std::for_each(dynamic.begin(), dynamic.end(), print);
std::cout << std::endl;
 
// or...
std::string substring{dynamic.begin(), dynamic.size()};
std::cout << substring << std::endl;
}
 

template<typename T, std::size_t Extent>
std::ostream& operator<<(std::ostream& os, const cetl::pf20::span<T, Extent>& sp)
{
std::for_each(sp.begin(), sp.end(), [&os](const char c) { os << c; });
return os;
}
 
 
TEST(example_02_span, static_span)
{
constexpr const char* greeting = "Hello Static World";
std::cout << cetl::pf20::span<const char, 12>{greeting, 12} << std::endl;
}