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Add example documentation

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Fixes #13.
This commit is contained in:
Jonathan Müller 2017-11-14 18:28:24 +01:00
commit c886ef31e4
7 changed files with 70 additions and 1 deletions
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12
example/comparison.cpp
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@ -4,6 +4,8 @@
/// \file
/// Generate equality comparisons.
///
/// Given an input file, it will generate comparison operators for each class that has the [[generate::comparison]] attribute.
#include <algorithm>
#include <iostream>
@ -14,6 +16,7 @@
#include "example_parser.hpp"
// whether or not the token string contains the given token
bool has_token(const cppast::cpp_token_string& str, const char* token)
{
auto iter = std::find_if(str.begin(), str.end(),
@ -21,6 +24,7 @@ bool has_token(const cppast::cpp_token_string& str, const char* token)
return iter != str.end();
}
// generates equality operator for a class
void generate_op_equal(std::ostream& out, const cppast::cpp_class& c)
{
out << "inline bool operator==(const " << c.name() << "& lhs, const " << c.name()
@ -29,9 +33,11 @@ void generate_op_equal(std::ostream& out, const cppast::cpp_class& c)
auto first = true;
// compare bases
for (auto& base : c.bases())
{
if (cppast::has_attribute(base, "generate::transient"))
// if they are not marked not to be compared
continue;
if (first)
@ -42,6 +48,7 @@ void generate_op_equal(std::ostream& out, const cppast::cpp_class& c)
<< "&>(rhs)\n";
}
// compare members
for (auto& member : c)
if (member.kind() == cppast::cpp_entity_kind::member_variable_t
&& !cppast::has_attribute(member, "generate::transient"))
@ -59,14 +66,17 @@ void generate_op_equal(std::ostream& out, const cppast::cpp_class& c)
out << "}\n\n";
}
// generate non equality operator for a class
void generate_op_non_equal(std::ostream& out, const cppast::cpp_class& c)
{
// just forwards
out << "inline bool operator!=(const " << c.name() << "& lhs, const " << c.name()
<< "& rhs) {\n";
out << " return !(lhs == rhs);\n";
out << "}\n\n";
}
// generate comparison operators for all classes in the file
void generate_comparison(const cppast::cpp_file& file)
{
cppast::visit(file,
@ -82,10 +92,12 @@ void generate_comparison(const cppast::cpp_file& file)
[](const cppast::cpp_entity& e, const cppast::visitor_info& info) {
if (e.kind() == cppast::cpp_entity_kind::class_t && !info.is_old_entity())
{
// it is a new class
auto& class_ = static_cast<const cppast::cpp_class&>(e);
auto& attribute =
cppast::has_attribute(e, "generate::comparison").value();
// generate requested operators
if (attribute.arguments())
{
if (has_token(attribute.arguments().value(), "=="))