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add sqare shape to example

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ado 2021-01-03 03:18:33 +01:00
parent a657670920
commit cc7e6f7806
1 changed files with 8 additions and 6 deletions
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README.md
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@ -250,12 +250,13 @@ Custom types can be used when converting values. An override of the **ss::extrac
function needs to be made and you are good to go. Custom conversion for an enum
would look like this:
```cpp
enum class shape { circle, rectangle, triangle };
enum class shape { circle, square, rectangle, triangle };
template <>
inline bool ss::extract(const char* begin, const char* end, shape& dst) {
const static std::unordered_map<std::string, shape>
shapes{{"circle", shape::circle},
{"square", shape::square},
{"rectangle", shape::rectangle},
{"triangle", shape::triangle}};
@ -298,15 +299,16 @@ std::vector<std::pair<shape, double>> shapes;
while (!p.eof()) {
using ss::nx;
auto [circle, rectangle, triangle] =
p.try_next<nx<shape, shape::circle>, double>()
auto [circle_or_square, rectangle, triangle] =
p.try_next<nx<shape, shape::circle, shape::square>, 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 (circle_or_square) {
auto& [s, x] = circle_or_square.value();
double area = (s == shape::circle) ? x * x * M_PI : x * x;
shapes.emplace_back(s, area);
}
if (rectangle) {