demangle.hpp

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#pragma once
 
/// @file userver/compiler/demangle.hpp
/// @brief @copybrief compiler::GetTypeName
/// @ingroup userver_universal
 
#include <chrono>
#include <string>
#include <typeindex>
 
USERVER_NAMESPACE_BEGIN
 
/// Compiler and C++ language related tweaks
namespace compiler {
 
/// Returns a human-readable representation of provided type name.
std::string GetTypeName(std::type_index type);
 
namespace detail {
 
template <class T>
struct TypeNameHelper {
  static std::string Get() { return GetTypeName(typeid(T)); }
};
 
template <>
struct TypeNameHelper<std::string> {
  static std::string Get() { return "std::string"; }
};
 
template <>
struct TypeNameHelper<std::chrono::nanoseconds> {
  static std::string Get() { return "std::chrono::nanoseconds"; }
};
 
template <>
struct TypeNameHelper<std::chrono::microseconds> {
  static std::string Get() { return "std::chrono::microseconds"; }
};
 
template <>
struct TypeNameHelper<std::chrono::milliseconds> {
  static std::string Get() { return "std::chrono::milliseconds"; }
};
 
template <>
struct TypeNameHelper<std::chrono::seconds> {
  static std::string Get() { return "std::chrono::seconds"; }
};
 
template <>
struct TypeNameHelper<std::chrono::minutes> {
  static std::string Get() { return "std::chrono::minutes"; }
};
 
template <>
struct TypeNameHelper<std::chrono::hours> {
  static std::string Get() { return "std::chrono::hours"; }
};
 
template <>
struct TypeNameHelper<std::chrono::steady_clock::time_point> {
  static std::string Get() { return "std::chrono::steady_clock::time_point"; }
};
 
template <>
struct TypeNameHelper<std::chrono::system_clock::time_point> {
  static std::string Get() { return "std::chrono::system_clock::time_point"; }
};
 
}  // namespace detail
 
/// @brief Returns a human-readable representation of provided type name.
///
/// GetTypeName(typeidT)) outputs the type, not the alias. For std::chrono
/// functions it gives unreadable results:
///     std::chrono::duration<long, std::ratio<1l, 1l> > - it's `seconds`
///
/// The `GetTypeName<T>()` provides a more readable output.
template <typename T>
std::string GetTypeName() {
  return detail::TypeNameHelper<T>::Get();
}
 
}  // namespace compiler
 
USERVER_NAMESPACE_END