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ircd: Add constexpr string_view constructors and literal _sv operator.

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This commit is contained in:
Jason Volk 2017-10-11 17:56:42 -07:00
parent 4f0de4915d
commit 239de5c072
1 changed files with 13 additions and 4 deletions
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17
include/ircd/string_view.h
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@ -41,6 +41,8 @@ namespace ircd
bool operator!(const string_view &); bool operator!(const string_view &);
bool defined(const string_view &); bool defined(const string_view &);
bool null(const string_view &); bool null(const string_view &);
constexpr string_view operator ""_sv(const char *const literal, const size_t size);
} }
/// Customized std::string_view (experimental TS / C++17) /// Customized std::string_view (experimental TS / C++17)
@ -136,7 +138,7 @@ struct ircd::string_view
// (non-standard) our array based constructor // (non-standard) our array based constructor
template<size_t SIZE> template<size_t SIZE>
string_view(const std::array<char, SIZE> &array) constexpr string_view(const std::array<char, SIZE> &array)
:string_view :string_view
{ {
array.data(), std::find(array.begin(), array.end(), '\0') array.data(), std::find(array.begin(), array.end(), '\0')
@ -144,7 +146,7 @@ struct ircd::string_view
// (non-standard) our buffer based constructor // (non-standard) our buffer based constructor
template<size_t SIZE> template<size_t SIZE>
string_view(const char (&buf)[SIZE]) constexpr string_view(const char (&buf)[SIZE])
:string_view :string_view
{ {
buf, std::find(buf, buf + SIZE, '\0') buf, std::find(buf, buf + SIZE, '\0')
@ -156,19 +158,26 @@ struct ircd::string_view
//{} //{}
// Required due to current instability in stdlib // Required due to current instability in stdlib
string_view(const std::experimental::fundamentals_v1::basic_string_view<char> &bsv) constexpr string_view(const std::experimental::fundamentals_v1::basic_string_view<char> &bsv)
:std::string_view{bsv} :std::string_view{bsv}
{} {}
/// Our default constructor sets the elements to 0 for best behavior by /// Our default constructor sets the elements to 0 for best behavior by
/// defined() and null() et al. /// defined() and null() et al.
string_view() constexpr string_view()
:std::string_view{nullptr, 0} :std::string_view{nullptr, 0}
{} {}
using std::string_view::string_view; using std::string_view::string_view;
}; };
/// Compile-time conversion from a string literal into a string_view.
constexpr ircd::string_view
ircd::operator ""_sv(const char *const literal, const size_t size)
{
return string_view{literal, size};
}
template<class T> template<class T>
struct ircd::vector_view struct ircd::vector_view
{ {