std::flat_map::contains(3)

💖 NAME 💖

std::flat_map::contains - std::flat_map::contains

okay so bestie, welcome to the std::flat_map::contains(3) page from the C++ Standard Libary — and yes, the manual name is literally C++ Standard Libary, spelling and all. It's giving "self-titled debut album" and we're keeping it exactly as it appears 💅✨

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🦋 Synopsis 🦋

Here are the two overloads, both marked since C++23 — no cap, this is the whole lineup:

bool contains( const Key& key ) const; (1) (since C++23)
template< class K >                    (2) (since C++23)
bool contains( const K& x ) const;

1. Checks if there is an element with key equivalent to key in the container.
2. Checks if there is an element with key that compares equivalent to the value x. This overload participates in overload resolution only if the qualified-id Compare::is_transparent is valid and denotes a type. It allows calling this function without constructing an instance of Key.

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🎀 Parameters 🎀

• key — key value of the element to search for
• x — a value of any type that can be transparently compared with a key

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✨ Return value ✨

true if there is such an element, otherwise false. That's the whole answer — found/not found, iconic binary energy 💖

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🔥 Complexity 🔥

Logarithmic in the size of the container. Short, sweet, and mathematically slaying.

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🌸 Example 🌸

Run this code, bestie:

// Run this code

#include <iostream>
#include <flat_map>

int main()
{
    std::flat_map<int, char> example{{1, 'a'}, {2, 'b'}};

    for (int x : {2, 5})
        if (example.contains(x))
            std::cout << x << ": Found\n";
        else
            std::cout << x << ": Not found\n";
}

🍓 Output: 🍓

2: Found
5: Not found

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👑 See also 👑

• find — finds element with specific key (public member function)
• count — returns the number of elements matching specific key (public member function)
• equal_range — returns range of elements matching a specific key (public member function)

🫶 source: http://cppreference.com · version/date: 2024.06.10 · page: std::flat_map::contains(3) — mwah, bestie, that's the whole page, go check your keys 💅✨