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std::bsearch

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< cpp‎ | algorithm

 
 
Algorithm Bibliothek
Funktionen
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Functions
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Nicht-modifizierende Sequenz Operationen
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Non-modifying sequence operations
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Modifizierende Sequenz Operationen
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Modifying sequence operations
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Partitionierungsoperationen
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Partitioning operations
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Sortierung Operationen (auf sortierten Bereiche)
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Sorting operations (on sorted ranges)
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Binary Suchaktionen (auf sortierten Bereiche)
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Binary search operations (on sorted ranges)
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Set-Operationen (auf sortierten Bereiche)
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Set operations (on sorted ranges)
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Heap-Operationen
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Heap operations
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Minimum / Maximum Operationen
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Minimum/maximum operations
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Numerische Operationen
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Numeric operations
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C-Bibliothek
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C library
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bsearch
 
Defined in header <cstdlib>
void* bsearch( const void* key, const void* ptr, size_t count, size_t size,
               int (*comp)(const void*, const void*) );
Findet ein Element gleich Element, auf das key in einem Array, auf das ptr. Das Array enthält count Elemente der Größe size. Funktion, auf die comp ist für Objekt Vergleich herangezogen .
Original:
Finds an element equal to element pointed to by key in an array pointed to by ptr. The array contains count elements of size size. Function pointed to by comp is used for object comparison.
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Inhaltsverzeichnis

[Bearbeiten] Parameter

key -
Zeiger auf das Element zu suchen
Original:
pointer to the element to search for
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ptr -
Zeiger auf das Array zu prüfen
Original:
pointer to the array to examine
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count -
Zahl der Element in dem Array
Original:
number of element in the array
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size -
Größe der einzelnen Elemente in dem Array in Bytes
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size of each element in the array in bytes
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comp - comparison function which returns ​a negative integer value if the first argument is less than the second,

a positive integer value if the first argument is greater than the second and zero if the arguments are equal. key is passed as the first argument, an element from the array as the second.
The signature of the comparison function should be equivalent to the following:

 int cmp(const void *a, const void *b);

The function must not modify the objects passed to it.

[Bearbeiten] Rückgabewert

Pointer auf die gefundene Element oder NULL sonst .
Original:
Pointer to the found element or NULL otherwise.
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[Bearbeiten] Beispiel

#include <cstdlib>
#include <iostream>
 
int compare(const void *ap, const void *bp)
{
    const int *a = (int *) ap;
    const int *b = (int *) bp;
    return *a - *b;
}
 
int show_ptr(int *p) 
{
    if (p == NULL) {
        std::cout << "NULL\n";
    } else {
        std::cout << p1 << ' ' << *p1 << '\n';
    }
}
 
int main(int argc, char **argv)
{
    const int ARR_SIZE = 8;
    int arr[ARR_SIZE] = { 1, 2, 3, 4, 5, 6, 7, 8 };
 
    int key1 = 4;
    int *p1 = (int *) std::bsearch(&key1, arr, ARR_SIZE, sizeof(arr[0]), compare);
 
    int key2 = 9;
    int *p2 = (int *) std::bsearch(&key2, arr, ARR_SIZE, sizeof(arr[0]), compare);
 
    std::cout << "p1: ";
    show_ptr(p1);
 
    std::cout << "p2: ";
    show_ptr(p2);
}

Output:

p1: 0xbf9a4c88 4
p2: NULL

[Bearbeiten] Siehe auch

Sortiert einen Bereich von Elementen mit nicht angegebenen Typ
Original:
sorts a range of elements with unspecified type
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(Funktion) [edit]
Bandbreite der Rendite von Elementen übereinstimmenden eine bestimmte Taste
Original:
returns range of elements matching a specific key
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(Funktions-Template) [edit]
C documentation for bsearch