D:/projects/ACE/proto/Source/strings.cpp

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#include "strings.h"

namespace ace {

const char StringStore::_empty = NULL_CHAR;

/*  Interface item implementation - for info see description in header file.
 */
const char * StringStore::store(const char *str) {
    
    static strings_store_t::key_compare str_comp;
    
    if ( *str == _empty ) {
        // Empty string is empty string :)
        return &_empty;
    }

    // Search for given string using lower_bound, because we want to know position,
    // where the string eventually would get inserted.
    strings_store_t::iterator i_str = _strings.lower_bound(str);
    if ( i_str != _strings.end() ) {
        // Compare (pointers to) strings using string_store_t comparator.
        if ( !str_comp(*i_str, str) && !str_comp(str, *i_str) ) {
            // Already exists:
            return *i_str;
        }
    }

    // New object - new memory needed...
    size_t memory_needed = strlen(str) + 1;
    char* mem = _memory_pool.get_memory(memory_needed); // This may throw!
    // The code above may throw safely... :)
    
    // Copy passed string into brand new memory:
    memcpy(mem, str, memory_needed);
    // Insert and return dereferenced iterator.
    return *_strings.insert(i_str, mem);
}

} // namespace ace

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