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ircd: Add functors for iless/iequals/igreater.

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This commit is contained in:
Jason Volk 2017-04-03 23:49:21 -07:00
parent e43b67d146
commit 669c12418a
1 changed files with 159 additions and 6 deletions
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165
include/ircd/lexical.h
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@ -151,8 +151,9 @@ string_view tokens_after(const string_view &str, const char *const &sep, const s
//
// Simple case insensitive comparison convenience utils
bool iequals(const string_view &a, const string_view &b);
bool iless(const string_view &a, const string_view &b);
struct iless;
struct igreater;
struct iequals;
// Vintage
size_t strlcpy(char *const &dest, const char *const &src, const size_t &bufmax);
@ -537,9 +538,56 @@ ircd::strlcat(char *const &dest,
}
#endif
struct ircd::iless
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const { return s; }
bool operator()(const string_view &a, const string_view &b) const;
bool operator()(const string_view &a, const std::string &b) const;
bool operator()(const std::string &a, const string_view &b) const;
bool operator()(const std::string &a, const std::string &b) const;
template<class A,
class B>
iless(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
iless() = default;
};
inline bool
ircd::iless(const string_view &a,
const string_view &b)
ircd::iless::operator()(const std::string &a,
const std::string &b)
const
{
return operator()(string_view{a}, string_view{b});
}
inline bool
ircd::iless::operator()(const string_view &a,
const std::string &b)
const
{
return operator()(a, string_view{b});
}
inline bool
ircd::iless::operator()(const std::string &a,
const string_view &b)
const
{
return operator()(string_view{a}, b);
}
inline bool
ircd::iless::operator()(const string_view &a,
const string_view &b)
const
{
return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
@ -548,9 +596,56 @@ ircd::iless(const string_view &a,
});
}
struct ircd::iequals
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const { return s; }
bool operator()(const string_view &a, const string_view &b) const;
bool operator()(const string_view &a, const std::string &b) const;
bool operator()(const std::string &a, const string_view &b) const;
bool operator()(const std::string &a, const std::string &b) const;
template<class A,
class B>
iequals(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
iequals() = default;
};
inline bool
ircd::iequals(const string_view &a,
const string_view &b)
ircd::iequals::operator()(const std::string &a,
const std::string &b)
const
{
return operator()(string_view{a}, string_view{b});
}
inline bool
ircd::iequals::operator()(const string_view &a,
const std::string &b)
const
{
return operator()(a, string_view{b});
}
inline bool
ircd::iequals::operator()(const std::string &a,
const string_view &b)
const
{
return operator()(string_view{a}, b);
}
inline bool
ircd::iequals::operator()(const string_view &a,
const string_view &b)
const
{
return std::equal(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
@ -559,6 +654,64 @@ ircd::iequals(const string_view &a,
});
}
struct ircd::igreater
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const { return s; }
bool operator()(const string_view &a, const string_view &b) const;
bool operator()(const string_view &a, const std::string &b) const;
bool operator()(const std::string &a, const string_view &b) const;
bool operator()(const std::string &a, const std::string &b) const;
template<class A,
class B>
igreater(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
igreater() = default;
};
inline bool
ircd::igreater::operator()(const std::string &a,
const std::string &b)
const
{
return operator()(string_view{a}, string_view{b});
}
inline bool
ircd::igreater::operator()(const string_view &a,
const std::string &b)
const
{
return operator()(a, string_view{b});
}
inline bool
ircd::igreater::operator()(const std::string &a,
const string_view &b)
const
{
return operator()(string_view{a}, b);
}
inline bool
ircd::igreater::operator()(const string_view &a,
const string_view &b)
const
{
return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) > tolower(b);
});
}
template<class T>
ircd::string_view
ircd::lex_cast(const T &t)