string_traits.hpp

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#pragma once
 
#include <cstddef>
#include <string>
#include <type_traits>
 
namespace cras
{
 
template<typename T>
struct is_c_string : public std::false_type {};
 
template<>
struct is_c_string<char*> : public std::true_type {};
 
template<>
struct is_c_string<char* const> : public std::true_type {};
 
template<>
struct is_c_string<const char*> : public std::true_type {};
 
template<>
struct is_c_string<const char* const> : public std::true_type {};
 
template<int I>
struct is_c_string<char[I]> : public std::true_type {};
 
template<int I>
struct is_c_string<const char[I]> : public std::true_type {};
 
template<typename T, typename = void>
struct is_string : public std::false_type {};
 
template<typename T>
struct is_string<T, ::std::enable_if_t<::cras::is_c_string<typename std::decay<T>::type>::value>> :
  public std::true_type {};
 
template<typename T>
struct is_string<T, ::std::enable_if_t<::std::is_same<typename std::decay<T>::type, ::std::string>::value>> :
  public std::true_type {};
 
}