Re: Can anyone explain this, bug in GCC????
* Joost Kraaijeveld:
Can anyone try to explain why on the line marked with "----->" the
variable "start" changes from it's original value to another value,
Example output (GCC 4.2 and 4.3 on Linux, 4.3 on Windows):
start 0: H
start 3: H
start 4: H
start 5a: A
start 5b: H
If you want the full source code:
line 577 and further
1 file, can be compiled by gcc 4.2 /4.3 Windows/Linux with an installed
void findAStarCheapestPath( const Vertex& start,
const Vertex& finish,
Edges& cheapestPathEdges) const
Vertex localStart = start;
std::cout << "start 0: " << start << "\n";
pathVertices.insert( pathVertices.end(), /*start*/localStart);
Edges vertexEdges = getEdgesFor( /*start*/localStart);
Edges::iterator e = vertexEdges.begin();
while (e != vertexEdges.end())
const Vertex& nextVertex = (*e).otherSide( /*start*/localStart);
//std::cout << "start 1: " << /*start*/localStart << "\n";
if (nextVertex == finish )
pathEdges.insert( pathEdges.end(), (*e));
pathVertices.insert( pathVertices.end(), finish);
std::cout << "start 2: " << start << "\n";
std::cout << "start 3: " << start << "\n";
if (std::find( allDiscoveredVertices.begin(),
allDiscoveredVertices.end(), nextVertex) == allDiscoveredVertices.end()
std::find( pathVertices.begin(), pathVertices.end(), nextVertex) ==
std::cout << "start 4: " << start << "\n";
------------------> std::cout << "start 5a: " << start << "\n";
std::cout << "start 5b: " << /*start*/localStart << "\n";
'const' is only a promise that the routine won't change the object.
Have you considered aliasing.
Other than that, try to reduce the problem to a minimum, complete program and
Cheers & hth.,
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