umap.cpp File Reference

#include <unordered_map>
#include <cstdint>
#include <stdexcept>

Go to the source code of this file.

Functions
void *	cpp_create_umap () noexcept
void	cpp_free_umap (void *umap_ptr) noexcept
void	cpp_add_entry_umap (void *umap_ptr, int key, int value) noexcept
int	cpp_get_value_umap (void *umap_ptr, int key, int default_value) noexcept
void	cpp_reserve_umap (void *umap_ptr, std::size_t n) noexcept

Function Documentation

cpp_add_entry_umap()

void cpp_add_entry_umap ( void * umap_ptr, int key, int value )

noexcept

Definition at line 46 of file umap.cpp.

                                                                     {
    // Insert or update the value at the given key.
    // This is not thread-safe if called concurrently with reads/writes.
    auto umap = static_cast<std::unordered_map<int,int>*>(umap_ptr);
    (*umap)[key] = value;
}

cpp_create_umap()

void * cpp_create_umap ( )

noexcept

Definition at line 33 of file umap.cpp.

                                 {
    // Create a new unordered_map on the heap and return it as a void pointer.
    auto* umap = new std::unordered_map<int,int>();
    return static_cast<void*>(umap);
}

cpp_free_umap()

void cpp_free_umap ( void * umap_ptr )

noexcept

Definition at line 39 of file umap.cpp.

                                            {
    // Delete the map, freeing the allocated memory.
    // Caller must ensure umap_ptr is a pointer returned by create_umap.
    auto umap = static_cast<std::unordered_map<int,int>*>(umap_ptr);
    delete umap;
}

cpp_get_value_umap()

int cpp_get_value_umap ( void * umap_ptr, int key, int default_value )

noexcept

Definition at line 53 of file umap.cpp.

                                                                            {
    // Retrieve a value from the map. If the key is not found, return default_value.
    // Safe for concurrent calls *only if* no other thread modifies the map.
    auto umap = static_cast<std::unordered_map<int,int>*>(umap_ptr);
    auto it = umap->find(key);
    return (it != umap->end()) ? it->second : default_value;
}

cpp_reserve_umap()

void cpp_reserve_umap ( void * umap_ptr, std::size_t n )

noexcept

Definition at line 61 of file umap.cpp.

                                                            {
    // Reserve space for at least n elements.
    // This can improve performance of subsequent insertions by avoiding rehashing.
    // Must be called before concurrent reads, and never during them.
    auto umap = static_cast<std::unordered_map<int,int>*>(umap_ptr);
    umap->reserve(n);
}