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48 lines
1.0 KiB
Markdown
48 lines
1.0 KiB
Markdown
# Array::EmplaceBack()
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```cpp
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template<typename... Args>
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T& EmplaceBack(Args&&... args);
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```
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在数组末尾就地构造一个元素,直接在内存中构造,不产生临时对象。
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**优势:**
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- 避免拷贝或移动开销
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- 直接在底层缓冲区末尾构造元素
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- 参数完美转发,支持任意构造参数
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**参数:**
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- `args` - 转发给 `T` 构造函数的参数包
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**返回:** 新构造元素的引用
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**复杂度:** 均摊 O(1)
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**线程安全:** ❌ 操作期间不可并发访问
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**示例:**
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```cpp
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struct Vertex {
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float x, y, z;
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Vertex(float x_, float y_, float z_) : x(x_), y(y_), z(z_) {}
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};
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Containers::Array<Vertex> vertices;
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// EmplaceBack 直接构造,不产生临时 Vertex 对象
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vertices.EmplaceBack(1.0f, 2.0f, 3.0f);
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vertices.EmplaceBack(4.0f, 5.0f, 6.0f);
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// 对比 PushBack(需要先构造临时对象)
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Vertex v(7.0f, 8.0f, 9.0f);
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vertices.PushBack(v); // 产生拷贝或移动
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// EmplaceBack 更高效,始终优先使用
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```
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## 相关文档
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- [Array 总览](array.md) - 返回类总览
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