TypeTools.hpp
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#pragma once
// Distributed under the 3-Clause BSD License. See accompanying
// file LICENSE or https://github.com/CLIUtils/CLI11 for details.
#include <exception>
#include <string>
#include <type_traits>
#include <vector>
namespace CLI {
// Type tools
/// A copy of enable_if_t from C++14, compatible with C++11.
///
/// We could check to see if C++14 is being used, but it does not hurt to redefine this
/// (even Google does this: https://github.com/google/skia/blob/master/include/private/SkTLogic.h)
/// It is not in the std namespace anyway, so no harm done.
template <bool B, class T = void> using enable_if_t = typename std::enable_if<B, T>::type;
/// Check to see if something is a vector (fail check by default)
template <typename T> struct is_vector { static const bool value = false; };
/// Check to see if something is a vector (true if actually a vector)
template <class T, class A> struct is_vector<std::vector<T, A>> { static bool const value = true; };
/// Check to see if something is bool (fail check by default)
template <typename T> struct is_bool { static const bool value = false; };
/// Check to see if something is bool (true if actually a bool)
template <> struct is_bool<bool> { static bool const value = true; };
namespace detail {
// Based generally on https://rmf.io/cxx11/almost-static-if
/// Simple empty scoped class
enum class enabler {};
/// An instance to use in EnableIf
constexpr enabler dummy = {};
// Type name print
/// Was going to be based on
/// http://stackoverflow.com/questions/1055452/c-get-name-of-type-in-template
/// But this is cleaner and works better in this case
template <typename T,
enable_if_t<std::is_integral<T>::value && std::is_signed<T>::value, detail::enabler> = detail::dummy>
constexpr const char *type_name() {
return "INT";
}
template <typename T,
enable_if_t<std::is_integral<T>::value && std::is_unsigned<T>::value, detail::enabler> = detail::dummy>
constexpr const char *type_name() {
return "UINT";
}
template <typename T, enable_if_t<std::is_floating_point<T>::value, detail::enabler> = detail::dummy>
constexpr const char *type_name() {
return "FLOAT";
}
/// This one should not be used, since vector types print the internal type
template <typename T, enable_if_t<is_vector<T>::value, detail::enabler> = detail::dummy>
constexpr const char *type_name() {
return "VECTOR";
}
template <typename T,
enable_if_t<!std::is_floating_point<T>::value && !std::is_integral<T>::value && !is_vector<T>::value,
detail::enabler> = detail::dummy>
constexpr const char *type_name() {
return "TEXT";
}
// Lexical cast
/// Signed integers / enums
template <typename T,
enable_if_t<(std::is_integral<T>::value && std::is_signed<T>::value), detail::enabler> = detail::dummy>
bool lexical_cast(std::string input, T &output) {
try {
size_t n = 0;
long long output_ll = std::stoll(input, &n, 0);
output = static_cast<T>(output_ll);
return n == input.size() && static_cast<long long>(output) == output_ll;
} catch(const std::invalid_argument &) {
return false;
} catch(const std::out_of_range &) {
return false;
}
}
/// Unsigned integers
template <typename T,
enable_if_t<std::is_integral<T>::value && std::is_unsigned<T>::value, detail::enabler> = detail::dummy>
bool lexical_cast(std::string input, T &output) {
if(!input.empty() && input.front() == '-')
return false; // std::stoull happily converts negative values to junk without any errors.
try {
size_t n = 0;
unsigned long long output_ll = std::stoull(input, &n, 0);
output = static_cast<T>(output_ll);
return n == input.size() && static_cast<unsigned long long>(output) == output_ll;
} catch(const std::invalid_argument &) {
return false;
} catch(const std::out_of_range &) {
return false;
}
}
/// Floats
template <typename T, enable_if_t<std::is_floating_point<T>::value, detail::enabler> = detail::dummy>
bool lexical_cast(std::string input, T &output) {
try {
size_t n = 0;
output = static_cast<T>(std::stold(input, &n));
return n == input.size();
} catch(const std::invalid_argument &) {
return false;
} catch(const std::out_of_range &) {
return false;
}
}
/// String and similar
template <typename T,
enable_if_t<!std::is_floating_point<T>::value && !std::is_integral<T>::value &&
std::is_assignable<T &, std::string>::value,
detail::enabler> = detail::dummy>
bool lexical_cast(std::string input, T &output) {
output = input;
return true;
}
/// Non-string parsable
template <typename T,
enable_if_t<!std::is_floating_point<T>::value && !std::is_integral<T>::value &&
!std::is_assignable<T &, std::string>::value,
detail::enabler> = detail::dummy>
bool lexical_cast(std::string input, T &output) {
std::istringstream is;
is.str(input);
is >> output;
return !is.fail() && !is.rdbuf()->in_avail();
}
} // namespace detail
} // namespace CLI