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Better version of EnableIf

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Henry Fredrick Schreiner 2017-01-28 22:03:51 -05:00
parent b73d1bd9b2
commit 9376400d74
1 changed files with 10 additions and 9 deletions
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19
include/CLI.hpp
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@ -42,11 +42,12 @@ namespace detail {
}
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;
// Copied from C++14
// template< bool B, class T = void >
// using enable_if_t = typename std::enable_if<B,T>::type;
template <bool Condition>
using EnableIf = typename std::enable_if<Condition, detail::enabler>::type;
struct Combiner {
int num;
@ -264,7 +265,7 @@ public:
};
template<typename T, EnableIf<std::is_integral<T>> = dummy>
template<typename T, EnableIf<std::is_integral<T>::value> = dummy>
bool lexical_cast(std::string input, T& output) {
logit("Int lexical cast " + input);
try{
@ -277,7 +278,7 @@ bool lexical_cast(std::string input, T& output) {
}
}
template<typename T, EnableIf<std::is_floating_point<T>> = dummy>
template<typename T, EnableIf<std::is_floating_point<T>::value> = dummy>
bool lexical_cast(std::string input, T& output) {
logit("Floating lexical cast " + input);
try{
@ -292,7 +293,7 @@ bool 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, detail::enabler>::type = dummy>
EnableIf<!std::is_floating_point<T>::value && !std::is_integral<T>::value> = dummy>
bool lexical_cast(std::string input, T& output) {
logit("Direct lexical cast: " + input);
output = input;
@ -383,7 +384,7 @@ public:
}
/// Add option for string
template<typename T, DisableIf<std::is_array<T>> = dummy>
template<typename T, EnableIf<!std::is_array<T>::value> = dummy>
void add_option(
std::string name, ///< The name, long,short
T &variable, ///< The variable to set
@ -447,7 +448,7 @@ public:
}
/// Add option for flag
template<typename T, EnableIf<std::is_integral<T>> = dummy>
template<typename T, EnableIf<std::is_integral<T>::value> = dummy>
void add_flag(
std::string name, ///< The name, short,long
T &count, ///< A varaible holding the count