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Update CppCoreGuidelines.md

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Andrew Pardoe
2017-10-23 11:22:02 -07:00
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parent 17f76d0258
commit 19d7fb1421
1 changed files with 2 additions and 2 deletions
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CppCoreGuidelines.md
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@@ -16251,11 +16251,11 @@ and should be used only as building blocks for meaningful concepts, rather than
int x = 7; int x = 7;
int y = 9; int y = 9;
auto z = plus(x, y); // z = 16 auto z = algo(x, y); // z = 16
string xx = "7"; string xx = "7";
string yy = "9"; string yy = "9";
auto zz = plus(xx, yy); // zz = "79" auto zz = algo(xx, yy); // zz = "79"
Maybe the concatenation was expected. More likely, it was an accident. Defining minus equivalently would give dramatically different sets of accepted types. Maybe the concatenation was expected. More likely, it was an accident. Defining minus equivalently would give dramatically different sets of accepted types.
This `Addable` violates the mathematical rule that addition is supposed to be commutative: `a+b == b+a`. This `Addable` violates the mathematical rule that addition is supposed to be commutative: `a+b == b+a`.