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Expr (a,b)+(c,d) is now equivalent to (a+c,b+d)

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This commit is contained in:
John Wiegley 2009-02-23 14:41:11 -04:00
parent 27fc3a3d43
commit 7b7814d466
1 changed files with 17 additions and 7 deletions
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24
src/value.cc
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@ -270,9 +270,15 @@ value_t& value_t::operator+=(const value_t& val)
}
else if (is_sequence()) {
if (val.is_sequence()) {
sequence_t& seq(as_sequence_lval());
seq.insert(seq.end(), val.as_sequence().begin(),
val.as_sequence().end());
if (size() == val.size()) {
sequence_t::iterator i = begin();
sequence_t::const_iterator j = val.begin();
for (; i != end(); i++, j++)
*i += *j;
} else {
throw_(value_error, "Cannot add sequences of different lengths");
}
} else {
as_sequence_lval().push_back(val);
}
@ -390,10 +396,14 @@ value_t& value_t::operator-=(const value_t& val)
sequence_t& seq(as_sequence_lval());
if (val.is_sequence()) {
foreach (const value_t& v, val.as_sequence()) {
sequence_t::iterator j = std::find(seq.begin(), seq.end(), v);
if (j != seq.end())
seq.erase(j);
if (size() == val.size()) {
sequence_t::iterator i = begin();
sequence_t::const_iterator j = val.begin();
for (; i != end(); i++, j++)
*i -= *j;
} else {
throw_(value_error, "Cannot subtract sequences of different lengths");
}
} else {
sequence_t::iterator i = std::find(seq.begin(), seq.end(), val);