Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Count the number of elements with a specific key.
std::size_t count( string_view key) const;
This function returns the count of the number of elements match key. The only possible return values
are 0 and 1.
Constant on average, worst case linear in size().
No-throw guarantee.
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Name |
Description |
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The key of the element to find. |