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Asked: 2026-05-14T01:15:42+00:00

Why won’t GCC allow a default parameter here? template<class edgeDecor, class vertexDecor, bool dir>

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Why won’t GCC allow a default parameter here?

 template<class edgeDecor, class vertexDecor, bool dir>
 Graph<edgeDecor,int,dir> Graph<edgeDecor,vertexDecor,dir>::Dijkstra(vertex s, bool print = false) const
 {

This is the output I get:

graph.h:82: error: default argument given for parameter 2 of ‘Graph<edgeDecor, int, dir> Graph<edgeDecor, vertexDecor, dir>::Dijkstra(Vertex<edgeDecor, vertexDecor, dir>, bool)’
graph.h:36: error: after previous specification in ‘Graph<edgeDecor, int, dir> Graph<edgeDecor, vertexDecor, dir>::Dijkstra(Vertex<edgeDecor, vertexDecor, dir>, bool)’

Can anyone see why I’m getting this?

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1 Answer

  1. Editorial Team

    You seem to already have declared the function (including the default parameter) in graph.h, line 36. Don’t repeat the default value in the function implementation, specifying it one time in the declaration is enough.

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