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Trying enable if, new version

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This commit is contained in:
Henry Fredrick Schreiner 2017-01-28 21:53:53 -05:00
parent aae31265b3
commit b73d1bd9b2
1 changed files with 24 additions and 18 deletions
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42
include/CLI.hpp
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@ -36,6 +36,18 @@ std::string join(const T& v, std::string delim = ",") {
namespace CLI {
// Based generally on https://rmf.io/cxx11/almost-static-if
namespace detail {
enum class enabler {};
}
constexpr detail::enabler dummy = {};
template <typename Condition>
using EnableIf = typename std::enable_if<Condition::value, detail::enabler>::type;
template <typename Condition>
using DisableIf = typename std::enable_if<!Condition::value, detail::enabler>::type;
struct Combiner {
int num;
bool positional;
@ -252,9 +264,8 @@ public:
};
template<typename T>
typename std::enable_if<std::is_integral<T>::value, bool>::type
lexical_cast(std::string input, T& output) {
template<typename T, EnableIf<std::is_integral<T>> = dummy>
bool lexical_cast(std::string input, T& output) {
logit("Int lexical cast " + input);
try{
output = (T) std::stoll(input);
@ -266,9 +277,8 @@ lexical_cast(std::string input, T& output) {
}
}
template<typename T>
typename std::enable_if<std::is_floating_point<T>::value, bool>::type
lexical_cast(std::string input, T& output) {
template<typename T, EnableIf<std::is_floating_point<T>> = dummy>
bool lexical_cast(std::string input, T& output) {
logit("Floating lexical cast " + input);
try{
output = (T) std::stold(input);
@ -281,11 +291,9 @@ lexical_cast(std::string input, T& output) {
}
// String and similar
template<typename T>
typename std::enable_if<
!std::is_floating_point<T>::value
&& !std::is_integral<T>::value, bool>::type
lexical_cast(std::string input, T& output) {
template<typename T,
typename std::enable_if<!std::is_floating_point<T>::value && !std::is_integral<T>::value, detail::enabler>::type = dummy>
bool lexical_cast(std::string input, T& output) {
logit("Direct lexical cast: " + input);
output = input;
return true;
@ -375,9 +383,8 @@ public:
}
/// Add option for string
template<typename T>
typename std::enable_if<!std::is_array<T>::value, void>::type
add_option(
template<typename T, DisableIf<std::is_array<T>> = dummy>
void add_option(
std::string name, ///< The name, long,short
T &variable, ///< The variable to set
std::string discription="", ///< Discription string
@ -440,11 +447,10 @@ public:
}
/// Add option for flag
template<typename T>
typename std::enable_if<std::is_integral<T>::value, void>::type
add_flag(
template<typename T, EnableIf<std::is_integral<T>> = dummy>
void add_flag(
std::string name, ///< The name, short,long
T &count, ///< A varaible holding the count
T &count, ///< A varaible holding the count
std::string discription="" ///< Discription string
) {