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Deduplicate filenames in Pos

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This saves ~4 MiB of RAM for NixOS system instantiation, and ~18 MiB
for "nix-env -qa".
This commit is contained in:
Eelco Dolstra 2013-10-08 15:19:59 +02:00
parent b1e3b1a4ac
commit 9deb822180
3 changed files with 7 additions and 6 deletions
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8
src/libexpr/nixexpr.hh
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@ -23,14 +23,16 @@ MakeError(UndefinedVarError, Error)
struct Pos
{
string file;
Symbol file;
unsigned int line, column;
Pos() : line(0), column(0) { };
Pos(const string & file, unsigned int line, unsigned int column)
Pos(const Symbol & file, unsigned int line, unsigned int column)
: file(file), line(line), column(column) { };
bool operator < (const Pos & p2) const
{
int d = file.compare(p2.file);
if (!line) return p2.line;
if (!p2.line) return false;
int d = ((string) file).compare((string) p2.file);
if (d < 0) return true;
if (d > 0) return false;
if (line < p2.line) return true;