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Andrew Pardoe
2017-11-27 12:04:22 -08:00
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CppCoreGuidelines.md
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@@ -1,3 +1,7 @@
---
layout: default
---
# <a name="main"></a>C++ Core Guidelines # <a name="main"></a>C++ Core Guidelines
November 27, 2017 November 27, 2017
@@ -5142,7 +5146,7 @@ A class with members that all have default constructors implicitly gets a defaul
vector<int> v; vector<int> v;
}; };
X x; // means X{{}, {}}; that is the empty string and the empty vector X x; // means X{{ "{{" }}}, {}}; that is the empty string and the empty vector
Beware that built-in types are not properly default constructed: Beware that built-in types are not properly default constructed:
@@ -7586,7 +7590,7 @@ Subscripting the resulting base pointer will lead to invalid object access and p
void use(B*); void use(B*);
D a[] = {{1, 2}, {3, 4}, {5, 6}}; D a[] = {{ "{{" }}1, 2}, {3, 4}, {5, 6}};
B* p = a; // bad: a decays to &a[0] which is converted to a B* B* p = a; // bad: a decays to &a[0] which is converted to a B*
p[1].x = 7; // overwrite D[0].y p[1].x = 7; // overwrite D[0].y
@@ -11645,7 +11649,7 @@ In the rare cases where the slicing was deliberate the code can be surprising.
class Shape { /* ... */ }; class Shape { /* ... */ };
class Circle : public Shape { /* ... */ Point c; int r; }; class Circle : public Shape { /* ... */ Point c; int r; };
Circle c {{0, 0}, 42}; Circle c {{ "{{" }}0, 0}, 42};
Shape s {c}; // copy Shape part of Circle Shape s {c}; // copy Shape part of Circle
The result will be meaningless because the center and radius will not be copied from `c` into `s`. The result will be meaningless because the center and radius will not be copied from `c` into `s`.
@@ -14623,7 +14627,7 @@ To make error handling systematic, robust, and non-repetitive.
void use() void use()
{ {
Foo bar {{Thing{1}, Thing{2}, Thing{monkey}}, {"my_file", "r"}, "Here we go!"}; Foo bar {{ "{{" }}Thing{1}, Thing{2}, Thing{monkey}}, {"my_file", "r"}, "Here we go!"};
// ... // ...
} }