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// map_erase.c
// From C++ example: https://docs.microsoft.com/en-us/cpp/standard-library/map-class?view=msvc-160#example-16
#include <stc/cstr.h>
#include <stdio.h>
#define i_key int
#define i_val_str
#define i_type mymap
#include <stc/csmap.h>
void printmap(mymap m)
{
c_foreach (elem, mymap, m)
printf(" [%d, %s]", elem.ref->first, cstr_str(&elem.ref->second));
printf("\nsize() == %" c_ZI "\n\n", mymap_size(&m));
}
int main()
{
c_auto (mymap, m1)
{
// Fill in some data to test with, one at a time
mymap_insert(&m1, 1, cstr_lit("A"));
mymap_insert(&m1, 2, cstr_lit("B"));
mymap_insert(&m1, 3, cstr_lit("C"));
mymap_insert(&m1, 4, cstr_lit("D"));
mymap_insert(&m1, 5, cstr_lit("E"));
puts("Starting data of map m1 is:");
printmap(m1);
// The 1st member function removes an element at a given position
mymap_erase_at(&m1, mymap_advance(mymap_begin(&m1), 1));
puts("After the 2nd element is deleted, the map m1 is:");
printmap(m1);
}
c_auto (mymap, m2)
{
// Fill in some data to test with, one at a time
m2 = c_make(mymap, {
{10, "Bob"},
{11, "Rob"},
{12, "Robert"},
{13, "Bert"},
{14, "Bobby"},
});
puts("Starting data of map m2 is:");
printmap(m2);
mymap_iter it1 = mymap_advance(mymap_begin(&m2), 1);
mymap_iter it2 = mymap_find(&m2, mymap_back(&m2)->first);
puts("to remove:");
c_foreach (i, mymap, it1, it2)
printf(" [%d, %s]", i.ref->first, cstr_str(&i.ref->second));
puts("");
// The 2nd member function removes elements
// in the range [First, Last)
mymap_erase_range(&m2, it1, it2);
puts("After the middle elements are deleted, the map m2 is:");
printmap(m2);
}
c_auto (mymap, m3)
{
// Fill in some data to test with, one at a time, using emplace
mymap_emplace(&m3, 1, "red");
mymap_emplace(&m3, 2, "yellow");
mymap_emplace(&m3, 3, "blue");
mymap_emplace(&m3, 4, "green");
mymap_emplace(&m3, 5, "orange");
mymap_emplace(&m3, 6, "purple");
mymap_emplace(&m3, 7, "pink");
puts("Starting data of map m3 is:");
printmap(m3);
// The 3rd member function removes elements with a given Key
int count = mymap_erase(&m3, 2);
// The 3rd member function also returns the number of elements removed
printf("The number of elements removed from m3 is: %d\n", count);
puts("After the element with a key of 2 is deleted, the map m3 is:");
printmap(m3);
}
}
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