编辑“︁C++11 constexpr”︁（章节）

== 代码示例 ==
=== 基础示例 ===
计算编译期阶乘：
<syntaxhighlight lang="cpp">
#include <iostream>

constexpr int compute_factorial(int n) {
    return (n <= 1) ? 1 : (n * compute_factorial(n - 1));
}

int main() {
    constexpr int val = compute_factorial(5);  // 编译期计算
    int dynamic_val = compute_factorial(5);    // 运行期计算
    std::cout << "Compile-time: " << val 
              << "\nRuntime: " << dynamic_val;
}
</syntaxhighlight>
{{Output|
Compile-time: 120
Runtime: 120
}}

=== 进阶应用 ===
编译期字符串哈希：
<syntaxhighlight lang="cpp">
constexpr unsigned int hash_str(const char* s, int off = 0) {
    return !s[off] ? 5381 : (hash_str(s, off+1) * 33) ^ s[off];
}

int main() {
    constexpr auto hash = hash_str("hello");
    static_assert(hash == 2107146360, "Hash mismatch");
}
</syntaxhighlight>