std::jmp_buf
来自 cppreference.com
在头文件 <csetjmp> 中定义 |
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typedef /* unspecified */ jmp_buf; |
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std::jmp_buf
类型是适合存储用于恢复调用环境的信息的数组类型。存储的信息足以在程序的正确块中恢复执行,并调用该块。浮点状态标志、打开的文件或任何其他数据的状态不会存储在 std::jmp_buf
类型的对象中。
[编辑] 示例
运行这段代码
#include <array> #include <cmath> #include <csetjmp> #include <cstdlib> #include <format> #include <iostream> std::jmp_buf solver_error_handler; std::array<double, 2> solve_quadratic_equation(double a, double b, double c) { const double discriminant = b * b - 4.0 * a * c; if (discriminant < 0) std::longjmp(solver_error_handler, true); // Go to error handler const double delta = std::sqrt(discriminant) / (2.0 * a); const double argmin = -b / (2.0 * a); return {argmin - delta, argmin + delta}; } void show_quadratic_equation_solution(double a, double b, double c) { std::cout << std::format("Solving {}x² + {}x + {} = 0...\n", a, b, c); auto [x_0, x_1] = solve_quadratic_equation(a, b, c); std::cout << std::format("x₁ = {}, x₂ = {}\n\n", x_0, x_1); } int main() { if (setjmp(solver_error_handler)) { // Error handler for solver std::cout << "No real solution\n"; return EXIT_FAILURE; } for (auto [a, b, c] : {std::array{1, -3, 2}, {2, -3, -2}, {1, 2, 3}}) show_quadratic_equation_solution(a, b, c); return EXIT_SUCCESS; }
输出
Solving 1x² + -3x + 2 = 0... x₁ = 1, x₂ = 2 Solving 2x² + -3x + -2 = 0... x₁ = -0.5, x₂ = 2 Solving 1x² + 2x + 3 = 0... No real solution
[编辑] 参见
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C 文档 用于 jmp_buf
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