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Replaced conversion macros with SFINAE

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This commit is contained in:
Jesse Beder
2009-11-10 21:23:52 +00:00
parent 6f94f954bb
commit 32491166ac
3 changed files with 60 additions and 22 deletions
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50
include/conversion.h
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@@ -18,26 +18,38 @@ namespace YAML
bool Convert(const std::string& input, bool& output);
bool Convert(const std::string& input, _Null& output);
#define YAML_MAKE_STREAM_CONVERT(type) \
inline bool Convert(const std::string& input, type& output) { \
std::stringstream stream(input); \
stream.unsetf(std::ios::dec); \
return stream >> output; \
template <typename>
struct is_numeric { enum { value = false }; };
template <> struct is_numeric <char> { enum { value = true }; };
template <> struct is_numeric <unsigned char> { enum { value = true }; };
template <> struct is_numeric <int> { enum { value = true }; };
template <> struct is_numeric <unsigned int> { enum { value = true }; };
template <> struct is_numeric <long int> { enum { value = true }; };
template <> struct is_numeric <unsigned long int> { enum { value = true }; };
template <> struct is_numeric <short int> { enum { value = true }; };
template <> struct is_numeric <unsigned short int> { enum { value = true }; };
template <> struct is_numeric <long long> { enum { value = true }; };
template <> struct is_numeric <unsigned long long> { enum { value = true }; };
template <> struct is_numeric <float> { enum { value = true }; };
template <> struct is_numeric <double> { enum { value = true }; };
template <> struct is_numeric <long double> { enum { value = true }; };
template <typename T, typename, bool = T::value>
struct enable_if;
template <typename T, typename R>
struct enable_if <T, R, true> {
typedef R type;
};
template <typename T>
inline bool Convert(const std::string& input, T& output, typename enable_if<is_numeric<T>, T>::type * = 0) {
std::stringstream stream(input);
stream.unsetf(std::ios::dec);
return stream >> output;
}
YAML_MAKE_STREAM_CONVERT(char)
YAML_MAKE_STREAM_CONVERT(unsigned char)
YAML_MAKE_STREAM_CONVERT(int)
YAML_MAKE_STREAM_CONVERT(unsigned int)
YAML_MAKE_STREAM_CONVERT(short)
YAML_MAKE_STREAM_CONVERT(unsigned short)
YAML_MAKE_STREAM_CONVERT(long)
YAML_MAKE_STREAM_CONVERT(unsigned long)
YAML_MAKE_STREAM_CONVERT(float)
YAML_MAKE_STREAM_CONVERT(double)
YAML_MAKE_STREAM_CONVERT(long double)
#undef YAML_MAKE_STREAM_CONVERT
}
#endif // CONVERSION_H_62B23520_7C8E_11DE_8A39_0800200C9A66