Enumerations

enum class ParseErr : int

Records

• class Price

• class Quantity

Functions

• double compute_sqrt (double value)

  计算非负且不超过 kComputeSqrtMaxInput 的平方根。

  Parameters

  value 待开平方的输入

  Returns

  sqrt(value)；非法输入（负数 / 非有限 / 超上限）返回 -1.0

  Defined at line 13 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/TutorialMath.cxx

• std::expected<Price, ParseErr> parse_price_cents (std::string_view s)

  类型安全的解析：用 std::expected 表达错误（非 magic -1）。

  Parameters

  s 仅含 ASCII 数字的分字符串

  Returns

  成功为 Price，失败为 ParseErr

  Defined at line 14 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/ModernParadigm.cxx

• bool operator== (Price , Price )

  Defined at line 21 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/ModernParadigm.hxx

• bool has_numeric_argument (int argc)

  判断命令行是否提供了数值参数。

  Parameters

  argc main() 的参数个数

  Returns

  argc >= 2 时为 true

  Defined at line 21 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/TutorialMath.cxx

• bool operator== (Quantity , Quantity )

  Defined at line 27 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/ModernParadigm.hxx

• std::int64_t sum_cents (std::span<const Price> prices)

  对价格数组求和（std::span 零拷贝 API）

  Defined at line 33 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/ModernParadigm.cxx

• template <NamedValue T>

  std::int32_t raw_qty (T t)

  提取 NamedValue 的原始数量值

  Defined at line 51 of file /Users/runner/work/CXX-CMake-template/CXX-CMake-template/single-exe-classic/src/ModernParadigm.hxx

Concepts

template <class T> NamedValue requires (T t) { { t.value } -> std::convertible_to<std::int32_t>; }

Variables

const double kComputeSqrtMaxInput

T t