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update documentation

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ado 2021-01-03 03:07:39 +01:00
parent 60c8156fb7
commit a657670920
1 changed files with 25 additions and 37 deletions
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README.md
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@ -275,7 +275,7 @@ for performance reasons.
The parser can also be used to effectively parse files whose rows are not
always in the same format (not a classical csv but still csv-like).
An example would be the best way to demonstrate such a scenario.
A more complicated example would be the best way to demonstrate such a scenario.
Supposing we have a file containing different shapes in given formats:
* circle radius
@ -294,45 +294,33 @@ if (!p.valid()) {
exit(EXIT_FAILURE);
}
p.set_error_mode(ss::error_mode::error_string);
std::vector<std::pair<shape, double>> shapes;
auto insert_circle = [&shapes](shape s, double r) {
if (s != shape::circle) {
return false;
}
shapes.emplace_back(s, r * r * M_PI);
return true;
};
auto insert_rectangle = [&shapes](shape s, double a, double b) {
if (s != shape::rectangle) {
return false;
}
shapes.emplace_back(s, a * b);
return true;
};
auto insert_triangle = [&shapes](shape s, double a, double b, double c) {
if (s != shape::triangle) {
return false;
}
double sh = (a + b + c) / 2;
shapes.emplace_back(s, sqrt(sh * (sh - a) * (sh - b) * (sh - c)));
return true;
};
while (!p.eof()) {
p.try_next<shape, double>(insert_circle)
.or_else<shape, double, double>(insert_rectangle)
.or_else<shape, double, double, double>(insert_triangle)
.on_error([](const std::string& error) {
std::cout << error << std::endl;
});
using ss::nx;
auto [circle, rectangle, triangle] =
p.try_next<nx<shape, shape::circle>, double>()
.or_else<nx<shape, shape::rectangle>, double, double>()
.or_else<nx<shape, shape::triangle>, double, double, double>()
.values();
if (circle) {
auto& [s, r] = circle.value();
shapes.emplace_back(s, r * r * M_PI);
}
if (rectangle) {
auto& [s, a, b] = rectangle.value();
shapes.emplace_back(s, a * b);
}
if (triangle) {
auto& [s, a, b, c] = triangle.value();
double sh = (a + b + c) / 2;
shapes.emplace_back(s, sqrt(sh * (sh - a) * (sh - b) * (sh - c)));
}
}
// do something with the stored data ...
/* do something with the stored shapes */
/* ... */
```