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50 lines
1.7 KiB
ReStructuredText
50 lines
1.7 KiB
ReStructuredText
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.. _sprout-string-char_traits-compare-iterator:
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###############################################################################
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compare
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###############################################################################
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Interface
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========================================
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.. sourcecode:: c++
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template<typename ConstInputIterator>
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static SPROUT_CONSTEXPR int compare(char_type const* s1, ConstInputIterator s2, std::size_t n);
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template<typename ConstInputIterator>
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static SPROUT_CONSTEXPR int compare(ConstInputIterator s1, char_type const* s2, std::size_t n);
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template<typename ConstInputIterator1, typename ConstInputIterator2>
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static SPROUT_CONSTEXPR int compare(ConstInputIterator1 s1, ConstInputIterator2 s2, std::size_t n);
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Returns
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========================================
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| If for each i in [0,n), ``eq(s1[i], s2[i])`` is true, return zero.
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| Otherwise, if for some j in [0,n), ``lt(s1[j], s2[j])`` is true and for each i in [0,j) ``eq(s1[i], s2[i])`` is true, return a negative value.
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| Otherwise, return a positive value.
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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 auto x = string<8>("homuhomu");
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SPROUT_STATIC_CONSTEXPR auto y = string<8>("madocchi");
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SPROUT_STATIC_CONSTEXPR auto result = char_traits<char>::compare(x.begin(), y.begin(), 8);
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static_assert(result < 0, "x is less than y.");
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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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