Differences between version 4 and previous revision of C++Notes.
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| Newer page: | version 4 | Last edited on Thursday, September 23, 2004 3:26:56 pm | by PerryLorier | Revert |
| Older page: | version 3 | Last edited on Thursday, September 23, 2004 3:26:38 pm | by PerryLorier | Revert |
@@ -24,10 +24,10 @@
std::map<foo_t,int*> foo_map;
...
- foo_map[foo]=new int;
- *foo_map[foo]=6;
+ foo_map[
[foo]=new int;
+ *foo_map[
[foo]=6;
And this code crashed. The reason was that my operator < was wrong. it voilated the contact of a < operator. I changed the "bool operator <" to "int cmp" and then defined operator <:
bool operator <(const foo_t &a, const foo_t &b) { return cmp(a,b) < 0; }
I also recommend adding some assert(3)'s to verify that your operators don't voilate the rules at runtime.
