C++核心準(zhǔn)則C.150:unique_ptr管理的對象要用make_unique()?構(gòu)建

C.150: Use?make_unique()?to construct objects owned by unique_ptrs
C.150:unique_ptr管理的對象要用make_unique()構(gòu)建
Reason(原因)
make_unique?gives a more concise statement of the construction. It also ensures exception safety in complex expressions.
make_unique提供了更簡潔的構(gòu)建語句。在復(fù)雜的表達(dá)式中,它也可以保證異常安全。
Example(示例)
unique_ptr p {new Foo{7}}; // OK: but repetitive
auto q = make_unique(7); // Better: no repetition of Foo
// Not exception-safe: the compiler may interleave the computations of //arguments as follows:
//
// 1. allocate memory for Foo,
// 2. construct Foo,
// 3. call bar,
// 4. construct unique_ptr.
//
// If bar throws, Foo will not be destroyed, and the memory-allocated //for it will leak.
f(unique_ptr(new Foo()), bar());
// Exception-safe: calls to functions are never interleaved.
f(make_unique(), bar());
Enforcement(實(shí)施建議)
Flag the repetitive usage of template specialization list?
提示重復(fù)使用模板初始化列表的代碼。
Flag variables declared to be?unique_ptr
提示使用unique_ptr定義變量的情況。
原文鏈接:
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c150-use-make_unique-to-construct-objects-owned-by-unique_ptrs
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