无法让setter工作

代码:

HEADER

class Parser{

private:
    unsigned int cant_documentos;
    unsigned int cant_terminos;
    std::map dicc_stopwords;
    std::map hash_frecuencias_globales;
    std::map > hash_frecuencias_locales;
    std::map hash_apariciones_unicas;
public:
    Parser();
    ~Parser();


public:
    void setFrecuenciasGlobales(std::map > frecuencias);
};

头顶

.CPP

void Parser::setFrecuenciasGlobales(map > frecuencias){
hash_frecuencias_globales = frecuencias;
cant_terminos = frecuencias.size();
}

CPP结束

编译器输出:

parser/parser.cpp:102:30: error: no match for ‘operator=’ in ‘((Parser*)this)->Parser::hash_frecuencias_globales = frecuencias’
parser/parser.cpp:102:30: note: candidate is:
/usr/include/c++/4.6/bits/stl_map.h:253:7: note: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(const std::map<_Key, _Tp, _Compare, _Alloc>&) [with _Key = std::basic_string, _Tp = unsigned int, _Compare = std::less >, _Alloc = std::allocator, unsigned int> >, std::map<_Key, _Tp, _Compare, _Alloc> = std::map, unsigned int>]
/usr/include/c++/4.6/bits/stl_map.h:253:7: note:   no known conversion for argument 1 from ‘std::map, std::map, unsigned int> >’ to ‘const std::map, unsigned int>&’

问题出在哪儿？