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Fix F.27 example, closes #2171

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Herb Sutter 2024-01-18 16:38:45 -05:00
parent 41426a1a5f
commit e44d35b55c
1 changed files with 12 additions and 8 deletions
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CppCoreGuidelines.md
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@ -3605,15 +3605,19 @@ Using `std::shared_ptr` is the standard way to represent shared ownership. That
##### Example
shared_ptr<const Image> im { read_image(somewhere) };
{
shared_ptr<const Image> im { read_image(somewhere) };
std::thread t0 {shade, args0, top_left, im};
std::thread t1 {shade, args1, top_right, im};
std::thread t2 {shade, args2, bottom_left, im};
std::thread t3 {shade, args3, bottom_right, im};
std::thread t0 {shade, args0, top_left, im};
std::thread t1 {shade, args1, top_right, im};
std::thread t2 {shade, args2, bottom_left, im};
std::thread t3 {shade, args3, bottom_right, im};
// detach threads
// last thread to finish deletes the image
// detaching threads requires extra care (e.g., to join
// before main ends), but even if we do detach t0..3 here ...
}
// ... shared_ptr ensures that eventually the last thread to
// finish safely deletes the image
##### Note
@ -19662,7 +19666,7 @@ To maximize the portability of `#include` directives across compilers, guidance
#include <vector>
#include <string>
#include "util/util.h"
// bad examples
#include <VECTOR> // bad: the standard library defines a header identified as <vector>, not <VECTOR>
#include <String> // bad: the standard library defines a header identified as <string>, not <String>