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add as_span overload for basic_string which doesn't have nonconst .data() like other contiguous containers

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This commit is contained in:
Elron A. Yellin 2015-11-20 17:50:02 -05:00
parent 04050a2162
commit e4d8d35af5
2 changed files with 17 additions and 0 deletions
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8
include/span.h
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@ -1568,6 +1568,14 @@ template <typename Cont>
constexpr auto as_span(Cont &&arr) -> std::enable_if_t<!details::is_span<std::decay_t<Cont>>::value, constexpr auto as_span(Cont &&arr) -> std::enable_if_t<!details::is_span<std::decay_t<Cont>>::value,
span<std::remove_reference_t<decltype(arr.size(), *arr.data())>, dynamic_range>> = delete; span<std::remove_reference_t<decltype(arr.size(), *arr.data())>, dynamic_range>> = delete;
// from basic_string which doesn't have nonconst .data() member like other contiguous containers
template <typename CharT, typename Traits, typename Allocator>
constexpr auto as_span(std::basic_string<CharT, Traits, Allocator> &str) -> span<CharT, dynamic_range>
{
fail_fast_assert(str.size() < PTRDIFF_MAX);
return {&str[0], static_cast<std::ptrdiff_t>(str.size())};
}
template <typename ValueType, size_t Rank> template <typename ValueType, size_t Rank>
class strided_span class strided_span
{ {

9
tests/span_tests.cpp
View File

@ -203,6 +203,15 @@ SUITE(span_tests)
overloaded_func(av3.as_span(dim<>(1), dim<3>(), dim<5>()), 't'); overloaded_func(av3.as_span(dim<>(1), dim<3>(), dim<5>()), 't');
} }
{
string str;
span<char> strspan = as_span(str);
(void)strspan;
const string cstr;
span<const char> cstrspan = as_span(cstr);
(void)cstrspan;
}
{ {
int a[3][4][5]; int a[3][4][5];
auto av = as_span(a); auto av = as_span(a);