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Added DeserializationError::code() to be used in switch statements (closes #846)

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This commit is contained in:
Benoit Blanchon
2018-11-13 14:31:53 +01:00
parent 5eee947ffe
commit 0a97d4c825
3 changed files with 132 additions and 16 deletions
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56
src/ArduinoJson/Deserialization/DeserializationError.hpp
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@ -11,6 +11,10 @@
namespace ARDUINOJSON_NAMESPACE {
class DeserializationError {
// safe bool idiom
typedef void (DeserializationError::*bool_type)() const;
void safeBoolHelper() const {}
public:
enum Code {
Ok,
@ -22,26 +26,52 @@ class DeserializationError {
};
DeserializationError() {}
DeserializationError(Code code) : _code(code) {}
DeserializationError(Code c) : _code(c) {}
friend bool operator==(const DeserializationError& err, Code code) {
return err._code == code;
// Compare with DeserializationError
friend bool operator==(const DeserializationError& lhs,
const DeserializationError& rhs) {
return lhs._code == rhs._code;
}
friend bool operator!=(const DeserializationError& lhs,
const DeserializationError& rhs) {
return lhs._code != rhs._code;
}
friend bool operator==(Code code, const DeserializationError& err) {
return err._code == code;
// Compare with Code
friend bool operator==(const DeserializationError& lhs, Code rhs) {
return lhs._code == rhs;
}
friend bool operator==(Code lhs, const DeserializationError& rhs) {
return lhs == rhs._code;
}
friend bool operator!=(const DeserializationError& lhs, Code rhs) {
return lhs._code != rhs;
}
friend bool operator!=(Code lhs, const DeserializationError& rhs) {
return lhs != rhs._code;
}
friend bool operator!=(const DeserializationError& err, Code code) {
return err._code != code;
// Behaves like a bool
operator bool_type() const {
return _code != Ok ? &DeserializationError::safeBoolHelper : 0;
}
friend bool operator==(bool value, const DeserializationError& err) {
return static_cast<bool>(err) == value;
}
friend bool operator==(const DeserializationError& err, bool value) {
return static_cast<bool>(err) == value;
}
friend bool operator!=(bool value, const DeserializationError& err) {
return static_cast<bool>(err) != value;
}
friend bool operator!=(const DeserializationError& err, bool value) {
return static_cast<bool>(err) != value;
}
friend bool operator!=(Code code, const DeserializationError& err) {
return err._code != code;
}
operator bool() const {
return _code != Ok;
// Returns internal enum, useful for switch statement
Code code() const {
return _code;
}
const char* c_str() const {