Re: #include and namespaces
In article <8762eory8s.fsf@gmail.com>, Gareth Owen <gwowen@gmail.com> wrote:
yatremblay@bel1lin202.(none) (Yannick Tremblay) writes:
However what are peoples opinion of specific using directives in
headers, e.g.: "using std::string;". Should they be absolutely
rejected as with "using namespace" or is there any situation under
which they are tolerable?
frob.hpp
--------
std::vector<std::string> tokenize(const std::string&);
I mean:
frob.hpp
----------
using std::string;
using std::vector;
vector<string> tokenize(const string &);
frob.cpp
--------
and:
#include "frob.hpp"
std::vector<std::string> tokenize(const std::string& in)
{
deleted:
//> using std::string;
//> using std::vector;
vector<string> tokens;
while(something) {
string tmp1 = foo(in);
string tmp2 = bar(in);
vector<string> parts;
tokens.push_back(etc....);
// more code
// ....
}
return tokens;
}
I can't see why that should be even slighty intolerable...
I mean using std::string; in the header, not in the cpp.
It is generally accepted that "using namespace xxx;" in headers is
unacceptable. I was asking for the general opinion on "using
std::string;" in headers.
Yannick
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