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nix flake show: Use evaluation cache

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This commit is contained in:
Eelco Dolstra 2020-04-17 01:02:29 +02:00
parent 7a9687ba30
commit 12b7eefbc5
2 changed files with 310 additions and 42 deletions
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11
src/libexpr/symbol-table.hh
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@ -28,6 +28,12 @@ public:
return s == s2.s;
}
// FIXME: remove
bool operator == (std::string_view s2) const
{
return s->compare(s2) == 0;
}
bool operator != (const Symbol & s2) const
{
return s != s2.s;
@ -68,9 +74,10 @@ private:
Symbols symbols;
public:
Symbol create(const string & s)
Symbol create(std::string_view s)
{
std::pair<Symbols::iterator, bool> res = symbols.insert(s);
// FIXME: avoid allocation if 's' already exists in the symbol table.
std::pair<Symbols::iterator, bool> res = symbols.emplace(std::string(s));
return Symbol(&*res.first);
}