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better exception message in some cases

This commit is contained in:
VaclavT 2021-11-07 12:24:00 +01:00
parent c8c25e9952
commit a5a0029341
2 changed files with 7 additions and 2 deletions
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7
ml.cpp
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@ -636,6 +636,10 @@ std::string MlError::description() const {
return MlPerfMon::instance().callstack() + "error: the expression `" + cause->debug() + "` with message \"" + msg + "\"";
}
const char * MlError::what() const noexcept {
return msg;
}
void MlEnvironment::combine(MlEnvironment const &other) {
// Normally, I would use the `insert` method of the `map` class,
// but it doesn't overwrite previously declared values for keys.
@ -1844,8 +1848,7 @@ MlValue sprintf(std::vector<MlValue> args, MlEnvironment &env) {
if (args.size() < 1 || args.size() > 2)
throw MlError(MlValue("sprintf", sprintf), env, args.size() > 2 ? TOO_MANY_ARGS : TOO_FEW_ARGS);
return MlValue::string(
mini_sprintf(args[0].as_string(), args.size() == 2 ? args[1].as_list() : std::vector<MlValue>{}));
return MlValue::string(mini_sprintf(args[0].as_string(), args.size() == 2 ? args[1].as_list() : std::vector<MlValue>{}));
}
// >>> (map (lambda (x) (+ x 10)) '(1 2 3 4 5 6))

2
ml.h
View File

@ -81,6 +81,8 @@ public:
// Get the printable error description.
std::string description() const;
const char * what() const noexcept override;
private:
MlValue *cause;
MlEnvironment env;