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40 lines
1 KiB
ReStructuredText
40 lines
1 KiB
ReStructuredText
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.. _sprout-string-char_traits-length:
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###############################################################################
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length
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###############################################################################
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Interface
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========================================
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.. sourcecode:: c++
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static SPROUT_CONSTEXPR std::size_t length(char_type const* s);
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Returns
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========================================
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| Equivalent to ``std::char_traits<Char>::length(s)`` in constant expression.
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Examples
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========================================
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.. sourcecode:: c++
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#include <sprout/string.hpp>
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using namespace sprout;
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SPROUT_STATIC_CONSTEXPR char const* x = "homuhomu";
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SPROUT_STATIC_CONSTEXPR auto result = char_traits<char>::length(x);
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static_assert(result == 8, "length of x is 8.");
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Complexity
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========================================
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| linear.
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| Recursive function invocations in *O(logN)* (logarithmic) depth.
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Header
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========================================
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| ``sprout/string/char_traits.hpp``
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| Convenience header: ``sprout/string.hpp``
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