util/string/util.h

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#pragma once
#include <cstddef>
#include <concepts>
#include <string>
 
namespace librepr::detail {
template <typename T>
concept string_like = requires(T& t) {
  t.size();
  { t.data() } -> std::convertible_to<const char*>;
};
 
template <std::size_t N>
constexpr std::size_t strsize(const char(&)[N]) {
  return (N - 1U);
}
 
constexpr std::size_t strsize(const char* str) {
  return std::char_traits<char>::length(str);
}
 
template <string_like T>
constexpr std::size_t strsize(T&& t) {
  return t.size();
}
}  // namespace librepr::detail