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[executable semantics] class-ify Declaration (#307)

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* [executable semantics] class-ify Declaration

NFC (no functional change).

Proof of concept that we can simplify code by replacing unions with safer, more
regular types.  Hand-rolled existentials (type-erasing CoW wrappers) are a follow-on
step that will further simplify usage.

Began adding `const` where possible, and replacing `std::string*` with
`std::string`.  Most `const`s can disappear as we replace reference semantics
with value semantics, but in the meantime it's an important step in the right
direction.
This commit is contained in:
Dave Abrahams
2021-02-27 13:32:03 -08:00
committed by GitHub
parent cd57024042
commit 2205fd52ce
14 changed files with 191 additions and 210 deletions
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executable_semantics/syntax_helpers.cpp
+7 -7
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@@ -20,22 +20,22 @@ void PrintSyntaxError(char* error, int line_num) {
void ExecProgram(std::list<Declaration*>* fs) {
std::cout << "********** source program **********" << std::endl;
for (const auto& decl : *fs) {
PrintDecl(decl);
for (const auto decl : *fs) {
decl->Print();
}
std::cout << "********** type checking **********" << std::endl;
state = new State(); // Compile-time state.
std::pair<TypeEnv*, Env*> p = TopLevel(fs);
TypeEnv* top = p.first;
Env* ct_top = p.second;
std::list<Declaration*> new_decls;
for (const auto& i : *fs) {
new_decls.push_back(TypeCheckDecl(i, top, ct_top));
std::list<const Declaration*> new_decls;
for (const auto i : *fs) {
new_decls.push_back(i->TypeChecked(top, ct_top));
}
std::cout << std::endl;
std::cout << "********** type checking complete **********" << std::endl;
for (const auto& decl : new_decls) {
PrintDecl(decl);
for (const auto decl : new_decls) {
decl->Print();
}
std::cout << "********** starting execution **********" << std::endl;
int result = InterpProgram(&new_decls);